On peux m'aider sil vous plait ? Resoudre les équation suivantes a)x^2-4x=0 b)3x^2-9x=0 c)4x^2=3x d)x=x^2 e) 3x^2-5=5x^2-5+3x f)25x^2+10x+1=0 g)9x^2-12x+4=0 h)x

a)x²-4x=0 
x (x -4)
x = 0  ou x -4 = 0  x = 4   donc solution (0;4)

b)3x²-9x=0
3x (x -3) =0
3x =0  x = 0    ou x-3 = 0  x = 3   donc solution ( 0.3)

c)4x²=3x
4x² -3x = 0
x ( 4x -3) = 0

x =0   4x-3 =0  4x = 3   x = 3/4   solution ( 0.3/4)


d)x=x²
x -x² =0
x (1-x) =0
x =0    1-x =0   -x = -1   x = 1    solution (0.1)

e) 3x²-5=5x²-5+3x
3x² -5 -5x² +5 -3x =0
-2x² -3x =0
x (-2x -3) =0
x =0   -2x -3 = 0    -2x =3   x = -3/2    solution (0 .  -3/2)

f)25x²+10x+1=0
(5x +1) (5x+1) =0
5x+1 =0  x = -1/5         soltion (-1/5)


 g)9x²-12x+4=0
(3x -2)(3x-2) =0
3x-2 =0     x =2/3   solution (2/3)

h)x²+2x+1=0
(x+1)(x+1) =0
x+1 =0
x =-1      solution (-1)

i) 16x²-8x+1=0
(4x -1)(4x-1) = 0
4x-1 =0
x = 1/4   solution (1/4)