Решить кв. уравнение
а) х2 – 4 =0 б) х2 + 3х = 0 в) х2 +11 = 0
г) х2 + 4х – 5 = 0 д) 2х2 – 5х – 7 = 0
а) х2 – 4 =0 б) х2 + 3х = 0 в) х2 +11 = 0
г) х2 + 4х – 5 = 0 д) 2х2 – 5х – 7 = 0
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Answers & Comments
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