7. Парабола з вершиною 5/2; -9/4
8. f(x)=2/x-2
y=2/x-2
x=2/y-2
2/y-2=x
2=(y-2)x
2=xy-2x
-xy=-2x-2
y=- -2x-2/x
y=2x+2/x
f-1(x)=2x+2/x
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7. Парабола з вершиною 5/2; -9/4
8. f(x)=2/x-2
y=2/x-2
x=2/y-2
2/y-2=x
2=(y-2)x
2=xy-2x
-xy=-2x-2
y=- -2x-2/x
y=2x+2/x
f-1(x)=2x+2/x