Question 884526
Plug in f(x) = 0 and solve for x.



f(x) = x^2 - 9



0 = x^2 - 9



x^2 - 9 = 0



(x-3)(x+3) = 0



x-3 = 0 or x+3 = 0



x = 3 or x = -3



The two solutions are x = 3 or x = -3 (each has multiplicity 1)