Question

If f(x) = 7x + 9, what is the value of f(2)?​

Answer 1

Answer: f ^− 1 ( x ) = x /7+ 9/ 7

Explanation:

Replace f ( x ) with y .

y = 7 x− 9

Interchange the variables.

x = 7 y − 9

solve for y

y = x/ 7 + 9 /7

Solve for y and replace with f ^− 1 ( x ) .

f ^− 1 ( x ) = x /7+ 9/ 7