(x^2+7x+ 12) + (x+4)
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Step-by-step explanation:
=x^2+7x+12+X+4
=x^2+8x+16
=x^2+4x+4x+16
=x(x+4)+4(x+4)
=(x+4)(x+4)
=(x+4)^2 answer.
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