x^4-3x^3+px^2+qx+r=0

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Solution for x^4-3x^3+px^2+qx+r=0 equation:


Simplifying
x4 + -3x3 + px2 + qx + r = 0

Reorder the terms:
px2 + qx + r + -3x3 + x4 = 0

Solving
px2 + qx + r + -3x3 + x4 = 0

Solving for variable 'p'.

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

Add '-1qx' to each side of the equation.
px2 + qx + r + -3x3 + -1qx + x4 = 0 + -1qx

Reorder the terms:
px2 + qx + -1qx + r + -3x3 + x4 = 0 + -1qx

Combine like terms: qx + -1qx = 0
px2 + 0 + r + -3x3 + x4 = 0 + -1qx
px2 + r + -3x3 + x4 = 0 + -1qx
Remove the zero:
px2 + r + -3x3 + x4 = -1qx

Add '-1r' to each side of the equation.
px2 + r + -3x3 + -1r + x4 = -1qx + -1r

Reorder the terms:
px2 + r + -1r + -3x3 + x4 = -1qx + -1r

Combine like terms: r + -1r = 0
px2 + 0 + -3x3 + x4 = -1qx + -1r
px2 + -3x3 + x4 = -1qx + -1r

Add '3x3' to each side of the equation.
px2 + -3x3 + 3x3 + x4 = -1qx + -1r + 3x3

Combine like terms: -3x3 + 3x3 = 0
px2 + 0 + x4 = -1qx + -1r + 3x3
px2 + x4 = -1qx + -1r + 3x3

Add '-1x4' to each side of the equation.
px2 + x4 + -1x4 = -1qx + -1r + 3x3 + -1x4

Combine like terms: x4 + -1x4 = 0
px2 + 0 = -1qx + -1r + 3x3 + -1x4
px2 = -1qx + -1r + 3x3 + -1x4

Divide each side by 'x2'.
p = -1qx-1 + -1rx-2 + 3x + -1x2

Simplifying
p = -1qx-1 + -1rx-2 + 3x + -1x2

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