bonjour
A = (2x - 1)² + (x + 2)³
• (2x - 1)² = (2x)² - 2*2x*1 + 1² = 4x² - 4x + 1
• (x + 2)³ = (x + 2) (x + 2)²
= (x + 2)( x² + 4x + 4)
= x*x² + x*4x + x*4 + 2x² + 2*4x + 2*4
= x³ + 4x² + 4x + 2x² + 8x + 8
= x³ + 4x² + 2x² + 4x + 8x + 8
= x³ + 6x² + 12x + 8
A = 4x² - 4x + 1 + x³ + 6x² + 12x + 8
A = x³ + 4x² + 6x² -4x + 12x + 1 + 8
A = x³ + 10x² + 8x + 9
