How do you factor the expression $3x^2 + 15x -42$ ?

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Answer 1 · 2018-04-05T18:23:38

Factors are: $(x+7)(3x-6)$

By middle term splitting,
$3x^2+15x-42=0$
$3x^2+21x-6x-42=0$
$3x(x+7)-6(x+7)=0$
$(x+7)(3x-6)=0$
$x=-7$ or, $x=2$

How do you factor the expression 3x^2 + 15x -423x^2 + 15x -42?