a]
x²-9=0
x²=9
x=±3
b]
6x²+3x=0
3x(2x+1)=0
3x=0 U 2x+1=0
x=0 x=-1/2
c]
x²+16=8x
x²-8x+16=0
(x-4)²=0
x-4=0
x=4
d]
2x²-2+3x=0
2x²+3x-2=0
Δ=9+16=25
√Δ=5
x1=-3-5/4=-8/4=-2
x2=-3+5/4=2/4=1/2
e]
2x²+5x-3=0
Δ=25+24=49
√Δ=7
x1=-5-7/4=-12/4=-3
x2=-5+7/4=2/4=1/2
f]
-3x²-2x+1=0
Δ=4+12=16
√Δ=4
x1=2-4/-6=-2/-6=1/3
x2=5+4/-6=6/-6=-1
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a]
x²-9=0
x²=9
x=±3
b]
6x²+3x=0
3x(2x+1)=0
3x=0 U 2x+1=0
x=0 x=-1/2
c]
x²+16=8x
x²-8x+16=0
(x-4)²=0
x-4=0
x=4
d]
2x²-2+3x=0
2x²+3x-2=0
Δ=9+16=25
√Δ=5
x1=-3-5/4=-8/4=-2
x2=-3+5/4=2/4=1/2
e]
2x²+5x-3=0
Δ=25+24=49
√Δ=7
x1=-5-7/4=-12/4=-3
x2=-5+7/4=2/4=1/2
f]
-3x²-2x+1=0
Δ=4+12=16
√Δ=4
x1=2-4/-6=-2/-6=1/3
x2=5+4/-6=6/-6=-1