Question

For which intervals is the function y = x^3+x^2-5x-6 increasing and decreasing?

Answer 1

\[\frac{ dy }{ dx }=3x^2+2x-5\]
it is increasing if \[\frac{ dy }{ dx }>0,decreasing~if~\frac{ dy }{ dx }<0\]

Answer 2

Would it be A??

Answer 3

Hmm :d

Answer 4

Am I correct?