а) 5х^2+x=0
x(5x+1)=0
x1=0 5x+1=0
5x=-1
x=-1/5
б) (6-3х)^2=4х-8
36-36x+9x^2=4x-8
9x^2-36x-4x+36+8=0
9x^2-40x+44=0
D=(-40)^2-4*9*44=1600-1584=16
x1\2=(40+-4)18
x1=2,4 x2=2
в) 2х^3-10х^2+3х-15=0
x(2x^2-10x+3)-15=0
x-15=0 2x^2-10x-12=0 \ :2
x1=15 x^2-5x-6=0
D=25+24=1
x1\2=(5+-1)\2
x1=2 x2=3
а) 5х^2+x=0
x(5x+1)=0
x1=0 5x+1=0
5x=-1
x=-1/5
б) (6-3х)^2=4х-8
36-36x+9x^2=4x-8
9x^2-36x-4x+36+8=0
9x^2-40x+44=0
D=(-40)^2-4*9*44=1600-1584=16
x1\2=(40+-4)18
x1=2,4 x2=2
в) 2х^3-10х^2+3х-15=0
x(2x^2-10x+3)-15=0
x-15=0 2x^2-10x-12=0 \ :2
x1=15 x^2-5x-6=0
D=25+24=1
x1\2=(5+-1)\2
x1=2 x2=3