x^4+px^3+qx^2+rx+s=0

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Solution for x^4+px^3+qx^2+rx+s=0 equation:


Simplifying
x4 + px3 + qx2 + rx + s = 0

Reorder the terms:
px3 + qx2 + rx + s + x4 = 0

Solving
px3 + qx2 + rx + s + x4 = 0

Solving for variable 'p'.

Move all terms containing p to the left, all other terms to the right.

Add '-1qx2' to each side of the equation.
px3 + qx2 + rx + s + -1qx2 + x4 = 0 + -1qx2

Reorder the terms:
px3 + qx2 + -1qx2 + rx + s + x4 = 0 + -1qx2

Combine like terms: qx2 + -1qx2 = 0
px3 + 0 + rx + s + x4 = 0 + -1qx2
px3 + rx + s + x4 = 0 + -1qx2
Remove the zero:
px3 + rx + s + x4 = -1qx2

Add '-1rx' to each side of the equation.
px3 + rx + s + -1rx + x4 = -1qx2 + -1rx

Reorder the terms:
px3 + rx + -1rx + s + x4 = -1qx2 + -1rx

Combine like terms: rx + -1rx = 0
px3 + 0 + s + x4 = -1qx2 + -1rx
px3 + s + x4 = -1qx2 + -1rx

Add '-1s' to each side of the equation.
px3 + s + -1s + x4 = -1qx2 + -1rx + -1s

Combine like terms: s + -1s = 0
px3 + 0 + x4 = -1qx2 + -1rx + -1s
px3 + x4 = -1qx2 + -1rx + -1s

Add '-1x4' to each side of the equation.
px3 + x4 + -1x4 = -1qx2 + -1rx + -1s + -1x4

Combine like terms: x4 + -1x4 = 0
px3 + 0 = -1qx2 + -1rx + -1s + -1x4
px3 = -1qx2 + -1rx + -1s + -1x4

Divide each side by 'x3'.
p = -1qx-1 + -1rx-2 + -1sx-3 + -1x

Simplifying
p = -1qx-1 + -1rx-2 + -1sx-3 + -1x

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