Предмет: Алгебра, автор: dog1shark2

3x+4x квадрат =0
8x квадрат+9x+1=0
6х квадрат -5х+7=0
-9х квадрат+12х-4=0
2дробь х+1дробь х-1=2


Ответы

Автор ответа: Ляно4ка
1
1)3x+4x²=0
4x²-3x=0
D=9-4*4*0=9=3²
x1=3+3/2=3
x2=3-3/2=0
2)8x²+9x+1=0
D=81-4*8*1=49=7²
x1=-9+7/16=-1/8
x2=-9-7/16=-1
3)6x²-5x+7=0
D=25-4*6*7=-143
корней нет
4)-9х²+12х-4=0/*(-1)
9х²-12х+4=0
D=144-4*9*4=0
x1=12+0/18=12/18=4/6=2/3
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