Which positive value of x maximizes the function y x3x3 Sol

Which positive value of x maximizes the function y = x-3x3

Solution

Now looking at the x values, y reaches maximum when x = 0.5

X	Y
0.1	0.10
0.2	0.19
0.3	0.26
0.4	0.31
0.5	0.33
0.6	0.31
0.7	0.24