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Question
Factorise the following, using the identity a2 – 2ab + b2 = (a – b)2.
x2 – 10x + 25
Sum
Solution
We have,
x2 – 10x + 25 = x2 – 2 · x · 5 + 52
= (x – 5)2
= (x – 5)(x – 5)
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 234]
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