Question

Which is the inverse of the function f(x) = x2 − 4?

y=√x+4
y=√x^2-4
y=√x+4
y=x^2-4

Answer 1

y=√x+4

Explanation:

y=x^2-4

x= y^2 -4

transpose the 4 to the other side

x + 4 = y^2 (when we're transposing we change the sign of the number)

√x+4 = √y^2

y =√x+4