x^4+21x^2+20=0

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


Simplifying
x4 + 21x2 + 20 = 0

Reorder the terms:
20 + 21x2 + x4 = 0

Solving
20 + 21x2 + x4 = 0

Solving for variable 'x'.

Factor a trinomial.
(20 + x2)(1 + x2) = 0

Subproblem 1

Set the factor '(20 + x2)' equal to zero and attempt to solve: Simplifying 20 + x2 = 0 Solving 20 + x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + x2 = 0 + -20 x2 = 0 + -20 Combine like terms: 0 + -20 = -20 x2 = -20 Simplifying x2 = -20 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(1 + x2)' equal to zero and attempt to solve: Simplifying 1 + x2 = 0 Solving 1 + x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + x2 = 0 + -1 x2 = 0 + -1 Combine like terms: 0 + -1 = -1 x2 = -1 Simplifying x2 = -1 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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