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HELPPPPPPP plesssss two part question. the question is on the picture

HELPPPPPPP plesssss two part question. the question is on the picture-example-1
User Nixmd
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A) 6x^3-13x^2-28x
B) (2x-7+3x^2+4x)+(2x-7+3x^2+4x)=perimeter
User KakhkAtion
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