### 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

after adding and then taking the square root? Write an equation for a machine that will undo Kirsta’s machine.

How can you undo adding

and then square rooting?