Odpowiedzi

2010-03-02T20:32:09+01:00

x=12-y

y(12-y)= y²+4
12y-y²=y²+4
2y²-12y+4=0
y²-6y+2=0
(y-3)²=7
y-3=√7
y=√7+3

x=9-√7