Answer:
3(x+7) = 3x+21
2x(x-4) = 2x²-8x
7(x+1)-2x =5x+7
(x-3)(x+1) =x²-2x-3
(x+4)² =x²+8x+16
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Answer:
3(x+7) = 3x+21
2x(x-4) = 2x²-8x
7(x+1)-2x =5x+7
(x-3)(x+1) =x²-2x-3
(x+4)² =x²+8x+16