x2-8x+15 = (x-3)(x-5)
x2 + 48x + 320
(x-8)(x+8) = x2-64
x2-64 = (x-8)(x+8) when factored
If that's + 4x2, the answer is 2x(x2 + 2x - 4)
x2 + 8x + 15 = (x + 3)(x + 5)
x2 + 8x + 15 = (x + 3) (x + 5).
That does not factor neatly.
x2 + 8x = x(x+8)
(x - 8)(x2 + 8x + 64)
x + 4
x2-8x+15 = (x-3)(x-5)
x2 + 8x + 12 = (x + 6) (x + 2)
(x + 6)(x + 2)
x2 - 8x + 32 = 0 (assuming)you can factor or use the quadratic equation.I recommend the quadratic equation.
Also 64
(x-4)(x-4)