Put simply, the equation for solving a cubic equation is x2 + 2ax +b = (x+a)2 + b-a2. This leads to x = -a +/- (a2 -b)1/2.

A cubic has from 1 to 3 real solutions.

The fact that every cubic equation with real coefficients has at least 1 real solution comes from the intermediate value theorem.

The discriminant of the equation tells you how many roots there are.

mL x 0.000001 = cubic meters

1 yd = 36 inches, thus

1 cubic yard = 46,656 cubic inches

a cubic trinomial is when there is 3 symbols such as

a+b+c+2h

there are 3 different symbols for the equation

just the same as

a*b-3h+2h

there is a *,-,+ in that equation making there be 3 making it a cubic trinomial