Răspuns:
Explicație pas cu pas:
a) x^2+3x=0
x(x+3)=0 => x = 0
x+3=0 => x = -3
b) x^2-2x=0
x(x-2) =0 => x=0
x-2=0 => x = 2
c) 3x^2+9x=0
x(3x+9)=0 => x = 0
3x+9=0 => 3x = 9 => x =9/3 => x = 3
d) 4x^2-8x=0
x(4x-8) = 0 => x = 0
4x-8 = 0 => x = -8/4 => x = - 2
e) 6x^2-x=0
x(6x-1) = 0 => x = 0
6x-1=0 => 6x = 1 => x = 1/6
f) -5x^2+8x=0
x(-5x+4) =0 => x = 0
-5x+4=0 => x = - 4/5
g) -0,6x^2+3,6x=0
x(-0,6x+3,6) = 0 => x = 0
-0,6x+3,6=0 => -0,6x = -3,6 => x = 3,6/0,6 => x = 6
h) -0,5x^2-2,5x=0
x(-0,5x-2,5)=0 => x = 0
-0,5x+2,5=0 => -0,5x = -2,5 => x = 2,5/0,5 => x = 5
i) 0,4x^2-2,4x=0
x(0,4x-2,4)=0 => x = 0
0,4x-2,4=0 => 0,4x = 2,4 => x = 2,4/0,4 => x = 6
