Find all the zeros of the function f(x)=x^2-8x-9

We have to find the zeros of the function f(x) = x^2 - 8x
- 9

For this we equate f(x) to 0 and solve the quadratic
equation that is obtained.

f(x) =
0

=> x^2 - 8x - 9 =
0

=> x^2 - 9x + x - 9 =
0

=> x(x - 9) +1(x - 9) =
0

=> (x - 9)(x + 1) =
0

for x - 9 = 0 , we have x =
9

for x + 1 = 0, we have x =
-1

The requires zeros are x = -1 and x =
9