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# Help! Maths!

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. I'm not sure if I've done it correctly, so I wanted to double check the answer. The question is as follows:
w,x and y are three integers
w is 2 less than x
y is 2 more than x
Prove that wy + 4 =x^2
2. so w = x -2
y = x+2
Set wy + 4 = L.H.S. and try to work it through from there!
the thread title made me laugh lol, reminds me of my first year at college
3. (Original post by k.russell)
so w = x -2
y = x+2
Set wy + 4 = L.H.S. and try to work it through from there!
the thread title made me laugh lol, reminds me of my first year at college
The way I did it was by giving x a value of 1, and worked on from there, would that be correct? So w became -1 and y became 3
4. (Original post by Botcampers)
I'm not sure if I've done it correctly, so I wanted to double check the answer. The question is as follows:
w,x and y are three integers
w is 2 less than x
y is 2 more than x
Prove that wy + 4 =x^2

Expand. Rearrange.
5. (Original post by Botcampers)
The way I did it was by giving x a value of 1, and worked on from there, would that be correct? So w became -1 and y became 3
no need to plug in numbers! this is algebra m8 no numbers allowed (apart from coefficients). In all seriousness, the substitution you should be making is to get y and w in terms of x then rearrange to prove that what you have is = to x^2
6. Hi, this is my solution to your question.

w = x-2
y = x+2
wy - (x-2)(x+2) - Difference of two squares
- x^2 - 2^2
- x^2 - 4
wy + 4 = x^2 - 4 + 4
4s cancel it out so is just x^2

Hope that helped!!

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