Question

x² + 7x - 18 = 0
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Answer 1

$x^2+7x-18=0\\x^2+9x-2x-18=0\\x(x+9)-2(x+9)=0\\(x+9)(x-2)=0\\x+9=0,x-2=0\\x_{1}=-9,x_{2}=2$