Quartic Equation Formula:

Quartic Equation : ax⁴ + bx³ + cx² + dx + e = 0
NOTE : Let p and q be the square root of any 2 non-zero roots.

p = sqrt(y₁)
q = sqrt(y₃)
r = -g / (8pq)
s = b / (4a)
x₁ = p + q + r – s
x₂ = p – q – r – s
x₃> = -p + q – r – s
x₄ = -p – q + r – s