2x^2+5x=0
x=0 2x=-5
x=-2,5
x^2-8x+7=0
D=9 x=1 x=7
x(2x+5)=0
x1=0
2x+5=0
2x=-5
x2=-2.5
D=64-4*1*7=64-28=36
x1=8+6/2=7
x2=8-6/2=1
2x^2+5x=0
x=0 2x=-5
x=-2,5
x^2-8x+7=0
D=9 x=1 x=7
2x^2+5x=0
x(2x+5)=0
x1=0
2x+5=0
2x=-5
x2=-2.5
x^2-8x+7=0
D=64-4*1*7=64-28=36
x1=8+6/2=7
x2=8-6/2=1