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# OCR C1 Surds watch

1. C1 p34 exercise 2B

4) Solve the following equations, giving each answer in the form k sqrt 2

(a) 2ysqrt2 - 3 = (5y / sqrt 2) +1

can somebody show me how you've worked this to get

y = -4 sqrt 2

I can do surds and stuff so far but this question isn't going down very well!!

Thanks,
Sean
2. Times the whole thing by root(2), and remember that root(2) * root(2) = 2. So on the left it would just become 4y.
3. 2y sqrt2 - 3 - 1 = (5y/ sqrt 2)
2y sqrt2 - 4 = (5y/ sqrt 2)
2y x (sqrt2) ^ 2 - 4 sqrt 2 = 5y <<<<<<<<<<<<<<<<(multiply by sqrt 2 on LHS)
4y - 5y = 4 sqrt 2
-y = 4 sqrt 2
y = - 4 sqrt 2

SIMPLE!
4. (Original post by Rup)
2y sqrt2 - 3 - 1 = (5y/ sqrt 2)
2y sqrt2 - 4 = (5y/ sqrt 2)
2y x (sqrt2) ^ 2 - 4 sqrt 2 = 5y <<<<<<<<<<<<<<<<(multiply by sqrt 2 on LHS)
4y - 5y = 4 sqrt 2
-y = 4 sqrt 2
y = - 4 sqrt 2

SIMPLE!
Thanks :] makes sense now

i'll post up 1 last 1 which i can't get my head around can u have a look pls :]
5. (Original post by Bleak Lemming)
Thanks :] makes sense now

i'll post up 1 last 1 which i can't get my head around can u have a look pls :]
oks
6. (Original post by Rup)
oks
Ok I've got as far as

This isn't going the right way here :s

EDIT: Wrong post!!

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