Question

PLEASE SOLVE MY QUESTIONS

$x {?}^{2} + 4x - 21$
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Answer 1

x^2 + 7x - 3x -21 = 0

x(x+7)-3(x+7)=0

(x+7)(x-3)=0

x= -7 or 3

Answer 2

Step-by-step explanation:

$x {}^{2} + 4x - 21$

By middle term splitting

$x {}^{2} + 7x - 3x - 21 \\ x(x + 7) - 3(x + 7) \\ (x - 3)(x + 7)$

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