The Student Room Group

Complete The Square

This is the question
cts.gif
However the answer in the back of the book is (x0.5)2+1.25(x-0.5)^2+1.25
I don't know what I am doing wrong any ideas.
Reply 1
You're right if the question is x^2-x+1
(edited 11 years ago)
Reply 2
Original post by wcp100
You're right if the question is x^2-x+1

Their answer seems to be for: x^2-x-1


that wouldn't give +1.25 it would give -1.25
Reply 3
Your answer is correct.
No
Reply 5
Original post by zed963
This is the question
cts.gif
However the answer in the back of the book is (x0.5)2+1.25(x-0.5)^2+1.25
I don't know what I am doing wrong any ideas.

You can check the answer yourself here:

Expand (x0.5)2+1.25(x-0.5)^2+1.25 and see what you get.
Reply 6
Original post by zed963
that wouldn't give +1.25 it would give -1.25


That's a good point, my stupid mistake. Sign error.

x^2-x+1.5
(edited 11 years ago)

Quick Reply