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1. The question is

given show that

I'm not entirely sure what I am meant to do here, have tried somethings but they were way off, so if anyone could help me I would be grateful.
2. cmon man this is easy. dont embarrass yourself. think about it first
3. haha i realise that and feel it's staring me in the face but no luck could you give me a hint to the first step at least might be able to get it from there
4. (Original post by semercer)
haha i realise that and feel it's staring me in the face but no luck could you give me a hint to the first step at least might be able to get it from there
try and get x^2 on its own. Do u know the first step?
5. if u really cant do it ill give u the solution. but the first step has got to be getting rid of the square root. u also see that u want y^4 and x^2, this should give u a clue what to do.
6. so I did this probably wrong but

y=sqrtx-1
y^2=x-1
x^2=(x-1)^2+2(x-1)+1
x^2=(x-1)(x-1)+2x-1
x^2=x^2-2x+2x+1-1
x^2=x^2
7. (Original post by semercer)
so I did this probably wrong but

y=sqrtx-1
y^2=x-1
x^2=(x-1)^2+2(x-1)+1
x^2=(x-1)(x-1)+2x-1
x^2=x^2-2x+2x+1-1
x^2=x^2
y=sqrtx-1y^2=x-1

this is right up to here. just try and get x^2 from whats in bold and get it on its own.
8. k so i added 1 to both sides and squared again to get

y^4+1=x^2

this can't be right tho am missing the 2y^2 I tried this earlier
9. (Original post by semercer)
k so i added 1 to both sides and squared again to get

y^4+1=x^2

this can't be right tho am missing the 2y^2 I tried this earlier
maybe its just late. you added the 1 correctly, but u suddenly have y^4.
it should be y^2+1=x
then u square both sides, so (y^2+1)^2=x^2

you then simply expand the bracket and get the answer
10. omg damn I'd like to agree with ya lol but maybe i'm just a little brain damaged haha
11. (Original post by semercer)
omg damn I'd like to agree with ya lol but maybe i'm just a little brain damaged haha
are you ****ing trolling?
12. (Original post by iamgreatness)
are you ****ing trolling?
I was kidding haha I hadn't slept for about a day when I came to do the question although it was still blindingly obvious, the work had to be in the next day ya see

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