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b. 9q² - 40q² = -31q²
c. x³ - 15x² + 140x = x(x² - 15x +140)
d. 8y³+ z³ = (2y + z) (4y² - 2yz + z²)
e. x² + 40 - 13x = (x + 8) (x+5)