Question

alguém me ajuda nessa equaçao? (y-1)^2+(y+2)^2=9

Answer 1

(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