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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: . Homework Help ✎

  1. 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?

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

    How can you undo adding 5 and then square rooting?

K(x) = sqrt of x + 5