### Home > A2C > Chapter 9 > Lesson 9.3.2 > Problem 9-141

Spud has a problem. He knows that the solutions for a quadratic equation are and

*, but in order to get credit for the problem he was supposed to have written down the equation. Unfortunately, he lost the paper with the original equation on it. His friends are full of advice.*

Alexia says, “

*Look, just remember when we made polynomials. If you wanted**and*to be the answers, you just used *. So you just do x minus the first one times x minus the other*.” Useto find the quadratic expression.

Use a generic rectangle.

Hugo says, “

*No, no, no. You can do it that way, but that's too complicated. I think you just start with*.” Try Hugo's method.and work backward. So , then, hmmm. Yeah, that'll work

Which way do you think Spud should use? Explain your choice.

Which do you think is more efficient? Which helps you understand the most?