Question

Which of the binomials below is a factor of this trinomial? 3x^2+18x+24

A. X-3
B. X+3
C. X+4
D. X-4

Answer 1

you have to rewrite it in factored form
divide the entire expression by 3, you get
x^2+6x+8, now find two numbers the product is equal to 1*8=8, and the sum is eqaul to 6, sum=B and product=A*C from Ax^2+Bx+C
2*4=8 and 2+4=6
the factored form is (x+2)(x+4), so your answer is C (x+4)