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2 years ago

10

Hello people ~factorise↷ x^2 + 4x –21

1 answer:

EleoNora [17]2 years ago

8 0

Let's see

$\\ \rm\rightarrowtail x^2+4x-21$

$\\ \rm\rightarrowtail x^2+7x-3x-21$

$\\ \rm\rightarrowtail x(x+7)-3(x+7)$

$\\ \rm\rightarrowtail (x-3)(x+7)$

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