Question

factor：
$5x {}^{2} {2} - 15x - 20$
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Answer 1

$5x ^{2} - 15x - 20$

$5x ^{2} - (20 - 5)x - 20$

$5x^{2} - 20x + 5x - 20$

$5x(x - 4) + 5( - 4)$

$(x - 4)(5x + 5)$

Answer 2

Here is your answer~