Question

factories x^2 + 15x +56

Answer 1

56=7×8
15=7+8
x2+15x+56
=x2+7x+8x+56
=x(x+7)+8(x+7)
=(x+7)(x+8)

Answer 2

x^2+15x+56

x^2+7x+8x+56

x(x+7)+8(x+7)

(x+8)(x+7)