0=x^4-9x^3+21x^2+21x-130

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Solution for 0=x^4-9x^3+21x^2+21x-130 equation: 


Simplifying
0 = x4 + -9x3 + 21x2 + 21x + -130

Reorder the terms:
0 = -130 + 21x + 21x2 + -9x3 + x4

Solving
0 = -130 + 21x + 21x2 + -9x3 + x4

Solving for variable 'x'.

Combine like terms: 0 + 130 = 130
130 + -21x + -21x2 + 9x3 + -1x4 = -130 + 21x + 21x2 + -9x3 + x4 + 130 + -21x + -21x2 + 9x3 + -1x4

Reorder the terms:
130 + -21x + -21x2 + 9x3 + -1x4 = -130 + 130 + 21x + -21x + 21x2 + -21x2 + -9x3 + 9x3 + x4 + -1x4

Combine like terms: -130 + 130 = 0
130 + -21x + -21x2 + 9x3 + -1x4 = 0 + 21x + -21x + 21x2 + -21x2 + -9x3 + 9x3 + x4 + -1x4
130 + -21x + -21x2 + 9x3 + -1x4 = 21x + -21x + 21x2 + -21x2 + -9x3 + 9x3 + x4 + -1x4

Combine like terms: 21x + -21x = 0
130 + -21x + -21x2 + 9x3 + -1x4 = 0 + 21x2 + -21x2 + -9x3 + 9x3 + x4 + -1x4
130 + -21x + -21x2 + 9x3 + -1x4 = 21x2 + -21x2 + -9x3 + 9x3 + x4 + -1x4

Combine like terms: 21x2 + -21x2 = 0
130 + -21x + -21x2 + 9x3 + -1x4 = 0 + -9x3 + 9x3 + x4 + -1x4
130 + -21x + -21x2 + 9x3 + -1x4 = -9x3 + 9x3 + x4 + -1x4

Combine like terms: -9x3 + 9x3 = 0
130 + -21x + -21x2 + 9x3 + -1x4 = 0 + x4 + -1x4
130 + -21x + -21x2 + 9x3 + -1x4 = x4 + -1x4

Combine like terms: x4 + -1x4 = 0
130 + -21x + -21x2 + 9x3 + -1x4 = 0

The solution to this equation could not be determined.

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