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Rezolvati in R, ecuatia x²+y²+8x+4y=-20​

Răspuns :

Alexandravert
x²+2*x*4+4²+y²+2*x*2+2²=-20
4²+2²=20
x²+y²+8x+4y+20​=0
(x+4)²+(y+2)²=0

(x+4)²=0
x+4=0=>x=-4
(y+2)²=0
y+2=0=>y=-2
S={(-4; -2)}

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