X2 -6x-72 factorise please help – InterviewSolution

1.

X2 -6x-72 factorise please help

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QUESTION:

X2 -6x-72 factorise

ANSWER:

$= > {x}^{2} - 6x - 72 = 0$

$= > {x}^{2} - 12x + 6x - 72 = 0$

$= > x(x - 12) + 6(x - 12) = 0$

$= > (x - 12)(x + 6) = 0$

$= > x = 12 \: \: \: or \: \: \: - 6$

HOPE this answer HELPS you ^_^ !

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