X^4-20x^2-21=0

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Solution for X^4-20x^2-21=0 equation:


Simplifying
X4 + -20x2 + -21 = 0

Reorder the terms:
-21 + X4 + -20x2 = 0

Solving
-21 + X4 + -20x2 = 0

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 + -20x2 = 0 + 21

Reorder the terms:
-21 + 21 + X4 + -20x2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + X4 + -20x2 = 0 + 21
X4 + -20x2 = 0 + 21

Combine like terms: 0 + 21 = 21
X4 + -20x2 = 21

Add '20x2' to each side of the equation.
X4 + -20x2 + 20x2 = 21 + 20x2

Combine like terms: -20x2 + 20x2 = 0
X4 + 0 = 21 + 20x2
X4 = 21 + 20x2

Simplifying
X4 = 21 + 20x2

Reorder the terms:
-21 + X4 + -20x2 = 21 + 20x2 + -21 + -20x2

Reorder the terms:
-21 + X4 + -20x2 = 21 + -21 + 20x2 + -20x2

Combine like terms: 21 + -21 = 0
-21 + X4 + -20x2 = 0 + 20x2 + -20x2
-21 + X4 + -20x2 = 20x2 + -20x2

Combine like terms: 20x2 + -20x2 = 0
-21 + X4 + -20x2 = 0

The solution to this equation could not be determined.

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