no.d gimana? tolong penjelasan

yang d dan f dan yg kmu lingkari itu nya

y = (x^2 + 2x)/ (x-5)
xy -5y = x^2 + 2x
-5y = x^2 + 2x - xy
-5y = x^2 + (2 - y)x
-5y + ((2-y)/2)^2 = (x + (1 - 1/2y))^2
√ (-5y + ((2-y)/2)^2) = x + 1 - 1/2 y
 ( √ (-5y + ((2-y)/2)^2)) - 1 + 1/2 y = x
f(x)^-1 = (√ (-5x + ((2-y)/2)^2)) - 1 + 1/2 x