Question

. Factorise :- x² + x - 12
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Answer 1

Answer:

(x-3)(x+4)

Step-by-step explanation:

x²+x-12

=x²+4x-3x-12   (splitting middle term)

=x(x+4)-3(x+4)

=(x-3)(x+4)

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Answer 2

Answer:

$= {x}^{2} + x - 12 \\ = {x}^{2} + 4x - 3x - 12 \\ = x(x + 4) - 3(x + 4) \\ = (x + 4)(x - 3) \\ \\ x + 4 = 0 \\ x = - 4 \\ x - 3 = 0 \\ x = 3$

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