Marinators Trivia Night

[skilbeck]

Cheers to DJ and Auburn for organising an awesome night. Congrats to Micks table for winning, too bad Table couldnt win it, but im sure we will next time

[djebella]

alicia said:

Anyone still disputing the square root of 25??

THE ANSWER IS 5

You Can Also Square Negative Numbers
Have a look at this:

If you square 5 you get 25: 5 × 5 = 25

But you could also square -5 to get 25: -5 × -5 = 25

(because a negative times a negative gives a positive)

So the square root of 25 can be 5 or -5

There can be a positive or negative answer to a square root!

But when people talk about "the" square root they usually mean just the positive one.

And when you use the radical symbol √ it always means just the positive one.

Example: √36 = 6 (not -6)

That's not true about the radical symbol always meaning just the positive one, it's primarily used to indicate the positive one but not always.

But you are correct that the question was worded incorrectly. It should have asked for the square roots of 25.

To be even more technically correct (pendantic/major maths nerd) the question should have asked what are the real roots of the polynomial x²-25=0.

I should also point out, i got the question wrong

[skilbeck]

djebella said:

alicia said:

Anyone still disputing the square root of 25??

THE ANSWER IS 5

You Can Also Square Negative Numbers
Have a look at this:

If you square 5 you get 25: 5 × 5 = 25

But you could also square -5 to get 25: -5 × -5 = 25

(because a negative times a negative gives a positive)

So the square root of 25 can be 5 or -5

There can be a positive or negative answer to a square root!

But when people talk about "the" square root they usually mean just the positive one.

And when you use the radical symbol √ it always means just the positive one.

Example: √36 = 6 (not -6)

That's not true about the radical symbol always meaning just the positive one, it's primarily used to indicate the positive one but not always.

But you are correct that the question was worded incorrectly. It should have asked for the square roots of 25.

To be even more technically correct (pendantic/major maths nerd) the question should have asked what are the real roots of the polynomial x²-25=0.

I should also point out, i got the question wrong

In technical terms, if they wanted just the positive square root, they would've asked for the Principal Square root. In asking for the square root, the idea was that it was a trick question and therefore they will be pedantic in marking it if they wish because on the surface, it is an easy question and i think the only people that would've screwed that bit of it up would be people at the annual scum trivia night. Our team got it and we would've disputed it if we got marked wrong for + or - 5.

[robc]

Thanks for a good night.
Love the Signed mariners shirt i won. My son's going to love getting it for Xmas

[Bearinator]

robc said:

Thanks for a good night.
Love the Signed mariners shirt i won. My son's going to love getting it for Xmas

Cheapscate

[Auburn Mariner]

First, great work DJ, a lot of hours work made for a great night, backed up with a precious three points at MES.

Right-oh, time for some clarifications:

1. DJ asked for the most first grade grand finals won. As explained by Dibo, premierships HAVE NOT always been decided by a Grand Final, and DJ clearly said and repeated that it was Grand Final wins. Nutmeg, they are NOT the same thing.

2. On the square root question; I research ALL my questions, as you should because you look like a real dill when you make a mistake.

My father is a mathematician (Bachelor's and Masters degrees from Macquarie Uni.) I asked him for two questions for this night and this one and the Pi question were his.

The square root of 25 is plus or minus 5. Full Stop. The square root symbol DOES NOT mean only a positive answer, I regret to inform you.

So dispute what you like. My source has been teaching maths for 49 years and is a thrice-published maths education author.

I should note, Trivia Nights are FUN and you ALWAYS put in trick questions. That is why DJ put the GF question in, why I put the square root question and ALSO why I gave a deliberately wrong answer to the member for Robertson question, just to see who was awake. I'm glad to say that everyone got this right, the howls when I gave the wrong answer made me very confident that our group would SMASH the Squadron at a competitive Trivia Night.

Best regards,

AM

[T]

auburnmariner said:

the howls when I gave the wrong answer made me very confident that our group would SMASH the Squadron at a competitive Trivia Night.

Best regards,

AM

Now there's an idea.... as long as there are no Centre Link questions, it should all be good.

Thanks to all those who contributed to making it a great night, even if I didn't end up back home till 1am

[frielcc]

Bugger... I'm still struggling at my 7 times table
Charles
CCLC

[robc]

bearinator said:

robc said:

Thanks for a good night.
Love the Signed mariners shirt i won. My son's going to love getting it for Xmas

Cheapscate

LOL It does sound cheap
but better than a box of chocolates

[brett]

As a fairly recent 4 unit Maths HSC completer, I can vouch that the + or - thing is a trick question used across the various levels of mathematic curriculum. I should have therefore got it right but didn't even register that...and the lesson learned is that all the shit you learn in school is quickly forgotten!

Well done to organisers, everything about the night was great. The Palm Tree Bandits will be back next year!

[skilbeck]

wyomingtiger said:

As a fairly recent 4 unit Maths HSC completer, I can vouch that the + or - thing is a trick question used across the various levels of mathematic curriculum.

a good question would've been the square root of -25 then , that definitely wouldve thrown some people.

[brett]

skilbeck said:

wyomingtiger said:

As a fairly recent 4 unit Maths HSC completer, I can vouch that the + or - thing is a trick question used across the various levels of mathematic curriculum.

a good question would've been the square root of -25 then , that definitely wouldve thrown some people.

Would have been easier for me - 5 x iota- it's straightforward! Regular 25 was just tricky.

[DJ]

Go ahead................make my day

and this is for those of you who didn't believe me!

[marinermick]

top night capped off by a 1-0 victory

thanks DJ and David

[dru]

skilbeck said:

wyomingtiger said:

As a fairly recent 4 unit Maths HSC completer, I can vouch that the + or - thing is a trick question used across the various levels of mathematic curriculum.

a good question would've been the square root of -25 then , that definitely wouldve thrown some people.

got to love working with i

[natalie]

djebella said:

That's not true about the radical symbol always meaning just the positive one, it's primarily used to indicate the positive one but not always.

But you are correct that the question was worded incorrectly. It should have asked for the square roots of 25.

To be even more technically correct (pendantic/major maths nerd) the question should have asked what are the real roots of the polynomial x²-25=0.

I should also point out, i got the question wrong

Yeah but djebella, you haven't disclosed the fact that your Bachelor Of Mathematics degree was from Newcastle, so herein may lie the problem ;D

[djebella]

natalie said:

djebella said:

That's not true about the radical symbol always meaning just the positive one, it's primarily used to indicate the positive one but not always.

But you are correct that the question was worded incorrectly. It should have asked for the square roots of 25.

To be even more technically correct (pendantic/major maths nerd) the question should have asked what are the real roots of the polynomial x²-25=0.

I should also point out, i got the question wrong

Yeah but djebella, you haven't disclosed the fact that your Bachelor Of Mathematics degree was from Newcastle, so herein may lie the problem ;D

[pjbaker]

djebella said:

natalie said:

Yeah but djebella, you haven't disclosed the fact that your Bachelor Of Mathematics degree was from Newcastle, so herein may lie the problem ;D

did you do the course MATH3750 Financial Mathematics?

[djebella]

pjbaker said:

djebella said:

did you do the course MATH3750 Financial Mathematics?

No. I took primarily pure (theoretical) maths subjects like Group Theory, Number Theory and Analysis.

[valentius borealis]

Rugby League grand finals didn't become mandatory until sometime in the 1950s. Before then, a grand final was only played if the minor premier was defeated in the finals.