Quadratic problem

Posted by rongmon on May 03, 2014; 12:08pm
URL: http://discussion-forum.276.s1.nabble.com/Quadratic-problem-tp7588370.html

The number of points at which the equation y = x^6 + x^3 - 2 cuts the x axis is

a. 1

b. 2

c. 4

d. 6

I tried solving for first derivative which is positive, from which i gathered answer as a.

Answer stated as b., how does one check for this?