X^4+2x^3-21=8

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Solution for X^4+2x^3-21=8 equation:


Simplifying
X4 + 2x3 + -21 = 8

Reorder the terms:
-21 + X4 + 2x3 = 8

Solving
-21 + X4 + 2x3 = 8

Solving for variable 'X'.

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

Add '21' to each side of the equation.
-21 + X4 + 21 + 2x3 = 8 + 21

Reorder the terms:
-21 + 21 + X4 + 2x3 = 8 + 21

Combine like terms: -21 + 21 = 0
0 + X4 + 2x3 = 8 + 21
X4 + 2x3 = 8 + 21

Combine like terms: 8 + 21 = 29
X4 + 2x3 = 29

Add '-2x3' to each side of the equation.
X4 + 2x3 + -2x3 = 29 + -2x3

Combine like terms: 2x3 + -2x3 = 0
X4 + 0 = 29 + -2x3
X4 = 29 + -2x3

Simplifying
X4 = 29 + -2x3

Reorder the terms:
-29 + X4 + 2x3 = 29 + -2x3 + -29 + 2x3

Reorder the terms:
-29 + X4 + 2x3 = 29 + -29 + -2x3 + 2x3

Combine like terms: 29 + -29 = 0
-29 + X4 + 2x3 = 0 + -2x3 + 2x3
-29 + X4 + 2x3 = -2x3 + 2x3

Combine like terms: -2x3 + 2x3 = 0
-29 + X4 + 2x3 = 0

The solution to this equation could not be determined.

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