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Home > A2C > Chapter 9 > Lesson 9.3.2 > Problem 9-140


Carlo was trying to factor the polynomial and find all of its roots. He had already found one factor by making a guess and trying it, so he had . He was trying to factor , and he had tried , , and , but none worked. Then Teo came by and said, “You should look at the graph.”

  1. How does the graph help?

It shows us that is a double root which means is a factor.

  1. Complete the problem.

Divide by .

Use a multiplication rectangle to set it up.

Now use the quadratic formula to solve for .