unknown54321 unknown54321

24-03-2017
Mathematics

contestada

witch of the binomials below is a factor of this trinomial
x^2 + 19x + 84
A)x-7
B)x^2+12
C)x+84
D)x+7

Respuesta :

Chaconne Chaconne

24-03-2017

Let's factor the trinomial.
x^2+19x+84.
Find two numbers that add to 19 and multiply to 84.
They happen to be 7 and 12.
x^2+7x+12x+84
x(x+7)+12(x+7)
Gather like terms.
(x+7)(x+12)
Therefore, the answer is D.

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