Choose the inverse of y=x^2-10

x = 5 + sqrt (y+25), for x>=5

x = 5 - sqrt (y+25), for x<=5

Step-by-step explanation:

y = x^2 - 10x + 25 - 25

y = (x-5) ^2 - 25

y+25 = (x-5) ^2

x-5 = + / -sqrt (y+25)

And you get TWO inverses:

x = 5 + sqrt (y+25), for x>=5

x = 5 - sqrt (y+25), for x<=5