Lim Zhen Heng's answer to Manchester's Secondary 4 A Maths question.
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The step with a red box is to complete a square within an expression itself.
Suppose you have x^2 - ax
To complete the square for above expression, add and subtract (a/2)^2 at the same time giving you
x^2 - ax + (a/2)^2 - (a/2)^2
= [x-(a/2)^2] - (a/2)^2
Suppose you have x^2 - ax
To complete the square for above expression, add and subtract (a/2)^2 at the same time giving you
x^2 - ax + (a/2)^2 - (a/2)^2
= [x-(a/2)^2] - (a/2)^2
Date Posted:
6 years ago
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