Question

Factor the trinomial and write each factor as a polynomial in descending order:
3x^2-2x-21

Answer 1

(3x-7)(x+3)

Answer 2

i would look for factors of 3(-21) that add up to be -2
3(-21)=9(-7)=-9(7) and -9+7=-2
so we have
3x^2-9x+7x-21
3x(x-3)+7(x-3)
(x-3)(3x+7)

Answer 3

sorry ,( 3x+7)(x-3)

Answer 4

(3x-7)(x+3)

Answer 5

it is (x-3)(3x+7) or (3x+7)(x-3)

Answer 6

x1=3 or x2=-7/3
ax^2+bx+c= a.(x-x1).(x-x2)
Then 3x^2-2x-21= 3(x-3)(x+7/3)=(x-3)(3x+7)