Question

Which of the binomials below is a factor of this trinomial?

3x2 + 18x-21
O A. X-3
O
B. X-1
O c. x+1
O D. X+ 3
SUBMIT

Answer 1

B. X-1

Explanation:

`3x^2 + 18x-21`

Factor out common term : 3

`=3\left(x^2+6x-7\right)\\\\Factor\: : x^2+6x-7\right \\\\=3\left(x-1\right)\left(x+7\right)`