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?