Квадратнi рiвняння 8 класс.
2x²-3x-2=0
-6x-7x-1=0
x²-8x+12=0
(2x-5)(x+2)=18
x²+7x=0
2x²-11x=0
-8x²=0
3x²-6=0
2x²-3x-2=0
-6x-7x-1=0
x²-8x+12=0
(2x-5)(x+2)=18
x²+7x=0
2x²-11x=0
-8x²=0
3x²-6=0
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Ответ:
1.d= (-3)^2 - 4 * 2 * - 2= 9+16=25
X1= 3+5/2*2=2
X2= 3-5/2*2= - 2/4= - 1/2
2. D= (-7)^2 - 4* -6 * - 1= 49 - 24=25
X1= 7+5/2*-6=12/-12= - 1
X2= 7-5/2* -6= 2/-12= - 1/6
3. D=(-8)^2-4*1*12=64-48=16
X1= 8+4/2=6
X2=8-4/2=2
4.2x +4x - 5x-10=18
X - 10-18=0
X=28
5.x(x+7)=0
X=0 и х+7=0
Х= - 7
6.х(2х-11)= 0
Х=0 и 2х-11=0
2х=11
Х= 11/2
7.- 8х^2=0 | /(-8)
Х^2=0
Х=0
8. 3х^2=6
Х^2= 2
Х1= 1
Х2 = -1