Question

${x }^{2} + 12x - 45$
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Answer 1

Answer:

(x - 3)(x + 15)

Step-by-step explanation:

$= {x}^{2} - 3x + 15x - 45 \\ = x (x- 3) + 15(x - 3) \\ = (x - 3)(x + 15)$

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Answer 2

Step-by-step explanation:

${x }^{2} + 12x - 45$

$= x(x - 3) + 15(x - 3)$

$= (x - 3)(x + 15)$

$x - 3 = 0$

$x + 15 = 0$

$x = 3 \: and \: - 15$