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Bianca11112
@Bianca11112
December 2019
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Alguém me ajuda nessa equaçao? (y-1)^2+(y+2)^2=9
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Nannda0
(y-1)²+(y+2)²=9
(y-1)•(y-1)+(y+2)•(y+2)=9
y²-y-y+1+y²+2y+2y+4=9
2y²+2y+5=9
2y²+2y+5-9=0
2y²+2y-4=0
a=2 b=2 c=-4
∆=2²-4•2•-4
∆=4+32
∆=36
y=-2±√36/2•2
y=-2±6/4
y'=-2+6/4
y'=4/4
y'=1
y"=-2-6/4
y"=-8/4
y"=-2
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Bianca11112
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(y-1)•(y-1)+(y+2)•(y+2)=9
y²-y-y+1+y²+2y+2y+4=9
2y²+2y+5=9
2y²+2y+5-9=0
2y²+2y-4=0
a=2 b=2 c=-4
∆=2²-4•2•-4
∆=4+32
∆=36
y=-2±√36/2•2
y=-2±6/4
y'=-2+6/4
y'=4/4
y'=1
y"=-2-6/4
y"=-8/4
y"=-2