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= 5y (5y² + 8y) - 8y (5y² + 8y)
= 25y³ + 40y² - 40y³ - 64y²
= 25y³ - 40y³ + 40y² - 64y²
= -15y³ - 24y²
,
b. (4x² - 3y²) (x² - 12y - 6)
= 4x² (x² - 12y - 6) - 3y² (x² - 12y - 6)
= 4x⁴ - 48x²y - 24x² - 3x²y² + 36y³ + 18y²