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Home > CCA2 > Chapter 8 > Lesson 8.3.2 > Problem 8-138

8-138.

Carlo was trying to factor the polynomial to find all of its roots. He had already found one factor by making a guess and dividing the polynomial, so he had . He was trying to factor , so he had tried dividing it by , , and , but none worked without a remainder. Then Teo came by and said, “You should look at the graph.” Homework Help ✎

8_138 Graph

  1. How does the graph help?

    It shows that is a double root, so is a repeated factor.

  2. Complete the problem.

    Divide   by .

    Now use the Quadratic Formula to solve for .