Question

I GIVE MEDALS

Decide whether the given x value is a zero of the function.

f(x) = x3 + 3x2 – 5x + 8; x = 4
Select one:
a. No, because there is more than one zero .
b. No, because substituting the value does not balance the equation.
c. Yes, because substituting the value does balance the equation.
d. none of the above

Answer 1

Have you considered plug in x=4 to the function f(x)?

Answer 2

just use the factor theorem

substitute x = 4 into the polynomial and show

f(4) = 0

which means when x = 4 the function is 0.

so if you get 0 as an answer after substituting the x = 4 is a zero

hope it helps

Answer 3

b ?

Answer 4

that's correct

f(4) = 80 I think