Question

$x { }^{2} + 7x - 18$
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Answer 1

Step-by-step explanation:

${x}^{2} + 7x - 18 \\ => {x}^{2} + 9x - 2x - 18 \\ => x(x + 9) - 2(x + 9) \\ => (x + 9)(x - 2)$

Answer 2

Answer:

${x}^{2} + 7x - 18 = 0$

${x}^{2} + (9 - 2)x = - 18 = 0$

${x}^{2} + 9x - 2x - 18 = 0$

$x(x + 9) - 2(x + 9) = 0$

$(x + 9)(x - 2) = 0$

$x = - 9 \: or \: x = 2$

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