Rozwiąż równania
1.
a) (2x-1)(x²-1)=6(x+1)
b) 3x+1)(x²-9)=4(3-x)
2.
a) 6x³-13x²=2-9x
b) 7x²=2x³+9
3.
a) x³+12x²+44x+48=0
4.
a) x³+9x²+23x+15=0
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1.
a) (2x-1)(x+1)(x-1)-6(x+1)=0
(x+1)((2x-1)(x-1)-6)=0
x+1=0 lub ((2x-1)(x-1)-6)=0
x=-1lub 2x^2-3x-5=0
delta=49 pierwiastek z delty= 7
x1=-1 x2= 2,5
odp. x=-1 lub x= 2,5
b) (3x+1)(x^2-9)-4(3-x)=0
(3x+1)(x-3)(x+3)+4(x-3)=0
(x-3)((3x+1)(x+3)+4)=0
x-3=0 lub ((3x+1)(x+3)+4)=0
x=3 lub 3x^2+10+7=0
delta=16 pier. z delty=4
x1=-1
x2=-2 1/3
2.a) 6x³-13x²-2+9x=0
W(1)=0
(6x³-13x²-2+9x): (x-1)= 6x²-7x+2
(6x²-7x+2)* (x-1)=0
6x²-7x+2=0 lub x-1=0
delta=1 pier=1
x1= 2/3 x2=1/2 x=1
b) 2x³+9-7x²=0
W(-1)=0
(2x³+9-7x²):(x+1)= 2x²-9x+9
(2x²-9x+9)*(x+1)=0
2x²-9x+9=0 lub x+1=0
delta=9 pier.= 3
x1= 1,5 x2=3 x=-1
3.x³+12x²+44x+48=0
W(-2)=0
(x³+12x²+44x+48):(x+2)= x²+10x+24
(x²+10x+24)*(X+2)=0
x²+10x+24=0 lub x+2=0
delta=4 pier.=2 lub x=-2
x1=-4 x2=-6 x=-2
4. x³+9x²+23x+15=0
W(-1)=0
(x³+9x²+23x+15):(x+1)= x²+ 8x+15
(x²+ 8x+15)*(x+1)=0
x²+ 8x+15=0 lub x+1=0
delta=4 pier.=2 lub x=-1
x1=-3 x2=-5 x=-1