Bonjour
Développer, réduire et ordonner les expressions suivantes.
a) (x+3)(x + 5) - 4x
= x² + 5x + 3x + 15 - 4x
= x² + 5x + 3x - 4x + 15
= x² + 4x + 15
b) x(3 – 2x) + 5x² + 2x
= 3x - 2x² + 5x² + 2x
= - 2x² + 5x² + 3x + 2x
= 3x² + 5x
c) (5 – t)(1 + 2t) + 2(3t+4)
= 5 + 10t - t - 2t² + 6t + 8
= - 2t² + 10t + 6t - t + 5 + 8
= - 2t² + 15t + 13
d) 2x²(x + 6) - x² + 4x² - 2x
= 2x³ + 12x² - x² + 4x² - 2x
= 2x³ + 15x² - 2x.
