Répondre :
(E1) x = -1 ou x = 5
(E2) x = 11/8 ou x = 4/9
(E3) (x-3) (5x-7) + x² -9=0
(x-3)(5x - 4 + x+3) = 0
(x-3)(6x - 1) = 0
x= 3 ou x = 1/6
(E4) (x+2)(4x+1) = 2(x+2)
(x+2)(4x + 1 -2) = 0
(x+2)(4x-1) = 0
x = -2 ou x = 1/4
(E1) x = -1 ou x = 5
(E2) x = 11/8 ou x = 4/9
(E3) (x-3) (5x-7) + x² -9=0
(x-3)(5x - 4 + x+3) = 0
(x-3)(6x - 1) = 0
x= 3 ou x = 1/6
(E4) (x+2)(4x+1) = 2(x+2)
(x+2)(4x + 1 -2) = 0
(x+2)(4x-1) = 0
x = -2 ou x = 1/4