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# SUPER QUICK FP1 Maths Question (help) Watch

1. I have a feeling this is a really obvious one but I can't seem to get it..

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2. (Original post by creativebuzz)
I have a feeling this is a really obvious one but I can't seem to get it..

Simultaneous equations?
3. (Original post by usycool1)
Simultaneous equations?
Well I made them equal to each other:

9x=3x

but then the 3x cancels out to give you

3=0

:/
4. (Original post by creativebuzz)
but then the 3x cancels out to give you
What do you mean by cancels out?
5. (Original post by creativebuzz)
Well I made them equal to each other:

9x=3x

but then the 3x cancels out to give you

3=0

:/
Ah never mind, I see what you've done (divided through by 3x?). If so, instead subtract both sides by 3x so that you get 6x = 0. Then solving for x, you get x = 0.

By dividing though by x (or 3x), you essentially divide through by zero which ruins things.

(Also, just as an aside, 3x/3x = 1 )
6. It's asking to show that (x, y) is (0, 0) so you can make the equations equal to each other to get 9x=3x.
Then for what value of x would this equation hold?
Next, what value of y do you get when you substitute the newly found value of x into either equation?
7. (Original post by usycool1)
Ah never mind, I see what you've done (divided through by 3x?). If so, instead subtract both sides by 3x so that you get 6x = 0. Then solving for x, you get x = 0.

By dividing though by x (or 3x), you essentially divide through by zero which ruins things.

(Also, just as an aside, 3x/3x = 1 )
Omg subtracting, of course! How obvious ariejkhjGH ugh that's so annoying! ahah, thank you so much!

If you don't mind, could you see where I went wrong in these two questions (sorry about the blurry photos and my messy handwriting) :P

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8. (Original post by creativebuzz)
Omg subtracting, of course! How obvious ariejkhjGH ugh that's so annoying! ahah, thank you so much!

If you don't mind, could you see where I went wrong in these two questions (sorry about the blurry photos and my messy handwriting) :P

For the first one, it looks like what you've done is fine so far. Now just take out a factor of and play around and you should get it.

For the second one, it looks like you've got the numerator the wrong way round - it should be u'v - uv' whereas you've done uv' - u'v
9. (Original post by usycool1)
For the first one, it looks like what you've done is fine so far. Now just take out a factor of and play around and you should get it.

For the second one, it looks like you've got the numerator the wrong way round - it should be u'v - uv' whereas you've done uv' - u'v

As for the first one, I've tried factoring (x+1)^-1/2 out and playing around with the numbers but I still can't seem to get the right answer... :/
10. (Original post by creativebuzz)
As for the first one, I've tried factoring (x+1)^-1/2 out and playing around with the numbers but I still can't seem to get the right answer... :/
11. (Original post by usycool1)
I managed to get question 1 in the end! So thanks!

But as for question 2, I can't seem to get it in the right form...

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12. (Original post by creativebuzz)
I managed to get question 1 in the end! So thanks!

But as for question 2, I can't seem to get it in the right form...

Nice.

You've made a mistake when going from the first line to the second.

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