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= (25x^2 + 20x + 20x + 16)(5x + 4)
= 25x^2 + 40x + 16 . (5x + 4)
= 125x^3 + 100x^2 + 200x^2 + 160x + 80x + 64
= 125x^3 + 300x^2 + 240x + 64
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