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4-7.

QUADRATIC FUNCTIONS   

Set the right side of each equation equal to and solve for .

  1. Let . What are the roots of this quadratic function? Give exact answers.

  2. Let . What are the roots of this quadratic function? Give exact answers.

  3. Let . What are the roots of this quadratic function? Give exact answers.

  4. The graph of a quadratic function crosses the -axis at . Write a possible equation for this function.

    If , is an -intercept, then is also an -intercept.

    Recall that in parts (a) through (c), you let and solved. One method here is to work backwards from that process.

    Step 1: