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5x²+10x+5y²+10y-10=0
5(x²+2x)+5(y²+2y)-10=0
(x²+2x+1)-1+(y²+2y+1)-1-10=0
5((x+1)²-1)+5((y+1)²-1)-10=0
5(x+1)²-5+5(y+1)²-5-10=0
5(x+1)²+5(y+1)²=20
(x+1)²+(y+1)²=4 ÷ 4
(x+1)²/4 + (y+1)²/4 = 1
a=+-2 , b=+-2