Question

f(x) = 9x3 + 18 x2 - 135x

-5 and 3

5 and -3

0, 5, and -3

0, -5, and 3

Answer 1

Trick, divide them by 9 first to simplify. :)

Answer 2

Do you know synthetic division? If yes, use it and try the choices given :)

Answer 3

Another trick, to know if a number is a zero of the function, substitute the number to x and if it resulted to zero, it must be a factor/zero of the function. :)

Answer 4

@Fallonfrancesca try it and tell me your answer. I already solved it. :)