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Function machine: Input unknown, rule: k of x, = square root of the sum, x + 5. Output unknown.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: .

  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 after adding and then taking the square root?

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

    How can you undo adding and then square rooting?