Bonjour
a. (x + 7)² + 2x + 4 = x² + 14x + 49 + 2x + 4 = x² + 16x + 53
b. - 3 (x - 4)² + 11 = - 3 (x² - 8x + 16) + 11 = - 3x² + 24x - 48 + 11 = - 3x² + 24x - 37
c. (2x - 5) (2x + 5) - (3x + 5)²
= 4x² - 25 - (9x² + 30x + 25)
= 4x² - 25 - 9x² - 30x - 25
= - 5x² - 30x - 50
d. (x - 1)² (x + 2)
= (x² - 2x + 1) (x + 2)
= x³ + 2x² - 2x² - 4x + x + 2
= x³ - 3x + 2.
