I know you meant "x^2 + 15x + 56" since you wanted to trinomial, but here are the steps for it:
x^2 + 15x + 56
= x^2 + 7x + 8x + 56
= (x^2 + 7x) + (8x + 56)
= x(x + 7) + 8(x + 7)
= (x+7) (x+8)
Hey there!
Good luck on your assignment and enjoy your day!
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