Question

Help! I will medal:)
Four polynomial functions are shown below:
f(x) = x3 + 3x2 - 4x - 12
g(x) = x2 - x - 2
p(x) = x3 + 3x + 2
t(x) = x2 + x - 2

Which of the following functions has -1 and 2 as its zeros? (4 points)


f(x)

g(x)

p(x)

t(x)

Answer 1

Plug x = -1 into f(x) to get...

f(x) = x^3 + 3x^2 - 4x - 12
f(-1) = (-1)^3 + 3(-1)^2 - 4(-1) - 12
f(-1) = ???

I'll let you do that last part. Tell me what you get.

Answer 2

i feel like it is g(x) or t(x)

Answer 3

Yes. Two roots...second degree. Which one has factors (x+1)(x-2) ?

Answer 4

so g(x) bc it factors both