4. Solve x(x + 1)2 (x + 2) = 72.
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x2 +x× 2x+4 =72
x2 + 3x +4 = 72
x2 + 3x +4- 72 =0
x2 + 3x -68 = 0
x2 + 3x +4 = 72
x2 + 3x +4- 72 =0
x2 + 3x -68 = 0
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