Hey MATE!!!

x^2 - 15x + 56

=> x^2 -8x -7x + 56

=> x( x -8) -7(x -8)

=> (x-8)(x - 7)

X = 8 or 7 Answer

Hope it helps :))

Step-by-step explanation:

x^2-15x+56

x^2-8x-7x+56

x(x-8)-7(x-8)

(x-8)(x-7)