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Question

Multiply:

(5) (9y − 4x) (8y2 − 5xy + 3x2)

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Solution

(9y − 4x) (8y2 − 5xy + 3x2)
= 9y(8y2 − 5xy + 3x2) − 4x(8y2 − 5xy + 3x2)
= (9y × 8y2) − (9y × 5xy) + (9y × 3x2) − (4x × 8y2) + (4x × 5xy) − (4x × 3x2)
= 72y3 − 45xy2 + 27x2y − 32xy2 + 20x2y − 12x3
= 72y3 + (−45xy2 − 32xy2) + (27x2y + 20x2y) − 12x3
= 72y3 + (−77xy2) + (47x2y) − 12x3
= 72y3 − 77xy2 + 47x2y − 12x3

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