Question

If y = 3x² - 9, what is its inverse?

Answer 1

y =
`\sqrt{(x+9)/(3)`

Explanation:

y = 3
`x^(2)` - 9

x = 3
`y^(2)` - 9

x + 9 = 3
`y^(2)`

x+9 / 3 =
`y^(2)`

y =
`\sqrt{(x+9)/(3)`