the cubic formula:
for a equation: ax^3+bx^2+cx+d=0
X= cbrt(((-b^3/27a^3) + (bc/6a^2) - (d/2a)) + sqrt(((-b^3/27a^3) + (bc/6a^2) - (d/2a))^2 + ((c/3a) - (b^2/9a^2))^3))) + cbrt(((-b^3/27a^3) + (bc/6a^2) - (d/2a)) - sqrt(((-b^3/27a^3) + (bc/6a^2) - (d/2a))^2 + ((c/3a) - (b^2/9a^2))^3))) - b/3a
for a equation: ax^3+bx^2+cx+d=0
X= cbrt(((-b^3/27a^3) + (bc/6a^2) - (d/2a)) + sqrt(((-b^3/27a^3) + (bc/6a^2) - (d/2a))^2 + ((c/3a) - (b^2/9a^2))^3))) + cbrt(((-b^3/27a^3) + (bc/6a^2) - (d/2a)) - sqrt(((-b^3/27a^3) + (bc/6a^2) - (d/2a))^2 + ((c/3a) - (b^2/9a^2))^3))) - b/3a







