SOLUTION: For which x values of the graph of {{{ y=-x^3-x^2 }}} above the x axis? Show or explain how you found your answer (showing is good).

Algebra ->  Rational-functions -> SOLUTION: For which x values of the graph of {{{ y=-x^3-x^2 }}} above the x axis? Show or explain how you found your answer (showing is good).      Log On


   

Question 970350: For which x values of the graph of +y=-x%5E3-x%5E2+ above the x axis? Show or explain how you found your answer (showing is good).
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
y=-x%5E2%28x%2B1%29
and the critical values of x are 0 and -1. This gives three intervals of the x-axis to check. Pick any value within each interval and check if y is positive or not positive.