Question

Given the polynomial f(x) = 2x3 + 7x2 + x − 10, which of the following is true?

a (x + 2) is a factor since f(2) = 0.

b (x − 2) is a factor since f(2) = 0.

c (x + 2) is a factor since f(−2) = 0.

d (x − 2) is a factor since f(−2) = 0.

Answer 1

Explanation:

Given:

2
`x^(3)`+7
`x^(2)`+x-10

factor it

I used MatLab roots(x) to find these so I kinda cheated :P

-2.5, -2 , 1

so we know -2 is a factor and, then

x+2=0 is a factor

so the "x+2" answer C)