Bonjour
e = (2/3x + 1)² + (x - 1/4)² = 4/3x² + 4/3x + 1 + x² - 2/4x + 1/16 = 4/9x² + 9/9x² + 16/12x - 6/12x + 16/16 + 1/16 = 13/9x² + 10/12x + 17/16 = 13/9x² + 5/6x + 17/16.
f = (x + 5) (x - 6) (x + 1) = (x² - 6x + 5x - 30) (x + 1) = x³ + x² - 6x² - 6x + 5x² + 5x - 30x - 30 = x³ - 31x - 30.
g = (2 + x)³ = (2 + x) (2 + x) (2 + x) = (4 + 2x + 2x + x²) (2 + x) = 8 + 4x + 4x + 2x² + 4x + 2x² + 2x² + x³ = x³ + 6x² + 12x + 8.
