Question

What are the zeroes of f(x) = x2 − 2x − 3? (1 point)?

Answer 1

Answer: The answer is X=3, -1

Explanation:

You can see in this image how it gave a point to me on my test, but I cant explain it so I have to give proof that its correct.

Answer 2

We have f(x) = 0;
Then x^2 - 1 - 2x - 2 = 0;
(x - 1)(x + 1) - 2(x + 1) = 0;
(x + 1)(x - 1 - 2) = 0;
(x + 1)(x - 3) = 0;
x + 1 = 0 or x - 3 = 0;
x = -1 or x = 3;
The zeroes of f are -1 and 3.