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   Decide how many real solutions each equation below has. Explain how you know. You may not need to solve the equation. 

  1. Can you easily solve for and find an answer?

    How many values are possible?

    One solution. What is your explanation?

  2. Try solving for by square-rooting each side.
    What do you notice?

  3. See hints from part (a).

  4. What type of number does an absolute value sign make? Positive or negative?

    No solution; Absolute value must be positive or zero.