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Question
Factorise the following.
x2 – 10x + 21
Sum
Solution
We have,
x2 – 10x + 21 = x2 – (7 + 3)x + 21
= x2 – 7x – 3x + 21
= x(x – 7) – 3(x – 7)
= (x – 7)(x – 3)
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 235]
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