7) (7x + 10y)×(10y - 7x) = 70xy - 49x² + 100y² - 70xy = 100y² - 49x²
8) (2/7x⁴ - 9y²z)×(2/7x⁴ + 9y²z) = (2/7x⁴)² - (9y²z)² = 4/49x^8 - 81y⁴z²
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7) (7x + 10y)×(10y - 7x) = 70xy - 49x² + 100y² - 70xy = 100y² - 49x²
8) (2/7x⁴ - 9y²z)×(2/7x⁴ + 9y²z) = (2/7x⁴)² - (9y²z)² = 4/49x^8 - 81y⁴z²