Question

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

f(x) = x^3 + 3x^2 – 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

?

Answer 2

You can tell if a value of x is a zero of the function by plugging the number in and simplifying. If it simplifies to 0, it is a zero.

Answer 3

What do you get when you plug in x=4?

Answer 4

16

Answer 5

I get bigger than that, but either way, it is not equal to 0, so x=4 is not a zero.

Answer 6

so b?

Answer 7

nevermind i got 144

Answer 8

I guess balancing the equation could mean equaling zero but I'm not too familiar with that terminology.

Answer 9

:)