Question

. Factorize:
(i) X2 + 4x -21

Answer 1

Answer:

(x+7)(x-3)

Step-by-step explanation:

x^2-3x+7x-21

x(x-3)+7(x-3)

(x+7)(x-3)

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Answer 2

x^2+7x-3x-21=0
x(x+7)-3(x+7)=0
x=3&x=-7