Respuesta :

choixongdong
x intercept when f(x) = 0
so
x^2-81 = 0
x^2 = 81
x = + 9 and x = -9

Answer
C -9

Answer:

The correct option is C.

Step-by-step explanation:

The given function is

[tex]f(x)=x^2-81[/tex]

Equate the given function equal to zero, to find the x-intercepts of the function.

[tex]f(x)=0[/tex]

[tex]x^2-81=0[/tex]

Add 81 both the sides.

[tex]x^2=81[/tex]

Taking square root both the sides.

[tex]x=\pm \sqrt{81}[/tex]

[tex]x=\pm 9[/tex]

The x-intercepts of the given function are -9 and 9. Therefore the correct option is C.

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