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y=-x^2+2x+15
-y=x^2-2x-15
-y=(x-1)^2-1-15
-y=(x-1)^2-16
-y+16=(x-1)^2
akar(-y)+akar16=x-1
akar(-y)+4+1=x
x=akar-y+5
f^-1(y)=akar(-y)+5
f^-1(x)=akar(-x)+5
jadi fungsi inversnya adalah f^-1(x)=akar(-x)+5