Question

Help answering these math questions

Answer 1

I’m pretty sure the first one is c

Answer 2

Answer:

Step-by-step explanation:

1. $y = x^{2} - 2x- 15 = x^{2} - 5x +3x -15 = x(x-5) + 3(x-5) = (x-5)(x+3)$

2.

$4x^{2} - 8x - 12 = 0\\x^{2} - 2x - 3 = 0\\x^{2} - 3x + x - 3 = 0\\ x(x-3) + 1 (x-3) = 0\\(x-3)(x+1) = 0$

x= 3 and x = -1

3. $x^{2} - 36 = 0$

  (x-6) (x+6) = 0

x = 6 and -6