Prove that the graph of y= ax^3 + bx^2 + cx + d has two distinct turning points if
b^2> 3ac. Find values of a,b,c and d for which the graph of this form has turning points at (0.5, 1) and (1.5, -1)
I'm finding trouble to solve the following question:
Find the cubic equation whose roots are the sqaures of that of
x^3 + 2x +1=0.
Any help would be greatful