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Question
Factorise the following.
x2 + 4x – 77
Sum
Solution
We have,
x2 + 4x – 77 = x2 + (11 – 7)x – 77
= x2 + 11x – 7x – 77
= x(x + 11) – 7(x + 11)
= (x + 11)(x – 7)
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Chapter 7: Algebraic Expression, Identities and Factorisation - Exercise [Page 235]
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