# Stupid question...how do I know when I'm done? Solving a polynomial equation

• February 18th 2009, 02:09 PM
cdbmath
Stupid question...how do I know when I'm done? Solving a polynomial equation
Quote:

Solve the equation $2x^2-x-7=0$. Show your work. No decimals answers will be accepted.
Am I supposed to solve for x? How do I know where to start, and how do I know when I am done?
• February 18th 2009, 02:20 PM
Plato
$x = \frac{{ - b \pm \sqrt {b^2 - 4ac} }}
{{2a}}
$