Question

Find the inverse formula of: y = f(t) = (2t)^(1/2) + 7

Answer 1

Here is what I have so far:
t = square root of (2y) + 7.
t - 7 = square root of 2y
(t-7)(t-7) = 2y
t^(2) - 14t + 49 = 2y
(t^(2)-14t + 49)/2 = y

The website is saying the variable 't' is not defined in this context. I tried X, but it didn't work either

Answer 2

y=(2t)^1/2+7
Inter changing x and t
t=(2y)^1/2+7
t-7=(2y)^1/2
t^2-14t+49=2y
y=1/2t^2-7t+49/2

Answer 3

lol.... got the same

Answer 4

why do you have 1/2t^(2)?