### Home > INT3 > Chapter 5 > Lesson 5.1.3 > Problem 5-48

5-48.

Kirsta was working with the function machine shown at right, but when she turned her back, her little brother Caleb dropped in a number. She did not see what he dropped in, but she did see what fell out:

What operations must she perform on

to undo what her machine did? Use this to determine what number Caleb dropped in. What number results in 9 after adding 5 and then taking the square root?

Write an equation for a machine that will undo Kirsta’s machine.

How can you undo adding 5 and then square rooting?