Question

Factor
x^2-3x-4

Answer 1

(x -4)(x +1)

Answer 2

You need two numbers that add to make -3, and two numbers that multiply to make -4.
For this problem -4 * 1 = -4 and -4 + 1 = -3.
So (x-4)(x+1).
You can expand to check:
(x-4)(x+1) = x*x - 4*x + x*1 - 4*1 = x^2 - 3x - 4.

Answer 3

ok thank you to you both