Rozwiąż równania(obliczeńia + wyniki )
1. (x-4)²=(x-4)(2x-1)
2. (x-3)²+(x-2)²-(x-1)²=0
3. (2x-3)²=8x
4. (x+3)²+5x²=(x-2)²
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1.
x²-8x+16=2x²-x-8x+4
x²-8x+16-2x²+x+8x-4=0
-x²+x+12=0
delta=1-4*-1*12=1+48=49 pierwiastek z delty=7
x1=(-1-7)/-2=-8/-2=4 x2= -1+7/-2=6/-2=-3 odp:x=4 i x= -3
2.
x²-6x+9+x²-4x+4-x²+2x-1=0
x²-8x+12=0
delta=(-8)²-4*1*12=64-48=16 pierwiastek z delty=4
x1=(8-4)/2=2 x2=(8+4)/2=6 odp:x=2 i x=6
3.
4x²-12x+9=8x
4x²-20x+9=0
delta=400-4*4*9=400-144=256 pierwiastek z delty =16
x1=(20-16)/8=4/8=1/2 x2=(20+16)/8=36/8=9/2
odp:x=jedna druga i x=dziewięć drugich
4.
x²+6x+9+5x²=x²-4x+4
5x²+6x+4x+9-4=0
5x²+10x+5=0 //:5
x²+2x+1=0
delta =4-4*1*1=4-4=0
x0=-2/2=-1 odp: x= -1