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x^2+4x+4=0
(x+2)(x+2)=0
x1 = x2 = -2
x+y=8 ------> y=8-x
x²+5x+(8-x)=4
x²+5x+8-x-4=0
x²+4x+4=0
(x+2)²=0
x=-2
substitusikan x=-2 ke y=8-x,
y=8-(-2)=8+2=10
HP: { -2,10}