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[tex] x^2 + 15 +56 \\ x^2 +(15+56) \\ 15 + 56 = 71 \\ x^2+71 \\ Answer: x^2 + 71 [/tex]

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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)