expand the following (5x+3)³
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(5x+3y)³ = (5x)³ + (3y)³ + 3(5x × 3y) (5x + 3y)
= 125x³ + 27y³ + 45xy (5x + 3y)
= 125x³ + 27y³ + 225x²y + 135xy²
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