SOLUTION: Hi there could you please help me understand how to figure out question (7iii) in the following past exam paper. Here is the link, thank you. http://papers.xtremepapers.com/CIE/

Question 865763: Hi there could you please help me understand how to figure out question (7iii) in the following past exam paper. Here is the link, thank you.
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w10_qp_12.pdf
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

Compare the coefficients on the right and left hand sides.
1.
.
.

2.
From eq. 1,

Then,

.
.

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