SOLUTION: At what value(s) of x does the function f(x)= x^2-9 cross the x axis? A- 0 B- 3 C- -3 D. -3 and 3

Algebra ->  Finance -> SOLUTION: At what value(s) of x does the function f(x)= x^2-9 cross the x axis? A- 0 B- 3 C- -3 D. -3 and 3      Log On


   

Question 1088753: At what value(s) of x does the function f(x)= x^2-9 cross the x axis?
A- 0
B- 3
C- -3
D. -3 and 3
Found 2 solutions by Boreal, Fombitz:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
It crosses the x-axis when y=0
x^2-9=0
x= 3 and -3
D.

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
f%28x%29=0
x%5E2-9=0
%28x%2B3%29%28x-3%29=0
Solve for x.