c) (-x + y)(5x+6y) = -5x² - 6xy + 5xy + 6y² = -5x² - xy + 6y²
d) (2t + 1)(1 - 3t) = 2t - 6t² + 1 - 3t = -t - 6t² + 1
e) (3a + 4)(a - 5) = 3a² - 15a + 4a - 20 = 3a² - 11a - 20
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c) (-x + y)(5x+6y) = -5x² - 6xy + 5xy + 6y² = -5x² - xy + 6y²
d) (2t + 1)(1 - 3t) = 2t - 6t² + 1 - 3t = -t - 6t² + 1
e) (3a + 4)(a - 5) = 3a² - 15a + 4a - 20 = 3a² - 11a - 20