Bonjour,
1 post = 1 exercice
Ex. 1 :
1) x = -1
donc : A(-1) = 25(-1)²-(1-2(-1))² = 16
2) A(x) = 25x² - (1 - 2x)²
= 25x² - (1 - 4x + 4x²)
= 21x² + 4x - 1
3) A(x) = 25x² - (1 - 2x)²
= (5x)² - (1 - 2x)²
= (5x-(1-2x))(5x+(1-2x))
= (7x-1)(3x+1)
