A) x2-4=0.
2x-4=0
2x=4
x=4:2
x=2
Б) x2+3x=0
5x=0
x=5:0
x=0
В)x2+11=0
2x+11=0
2x=-11
x=-11/2;x=5 1/2
Г) x2+4x-5=0
2x+4x-5=0
6x-5=0
6x=5
x=5/6
Д)2x2-5x-7=0
4x-5x-7=0
-x-7=0
-x=7
x=-7
A) x2-4=0.
2x-4=0
2x=4
x=4:2
x=2
Б) x2+3x=0
5x=0
x=5:0
x=0
В)x2+11=0
2x+11=0
2x=-11
x=-11/2;x=5 1/2
Г) x2+4x-5=0
2x+4x-5=0
6x-5=0
6x=5
x=5/6
Д)2x2-5x-7=0
4x-5x-7=0
-x-7=0
-x=7
x=-7