0=20x^4-45x^2-500

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Solution for 0=20x^4-45x^2-500 equation:


Simplifying
0 = 20x4 + -45x2 + -500

Reorder the terms:
0 = -500 + -45x2 + 20x4

Solving
0 = -500 + -45x2 + 20x4

Solving for variable 'x'.

Combine like terms: 0 + 500 = 500
500 + 45x2 + -20x4 = -500 + -45x2 + 20x4 + 500 + 45x2 + -20x4

Reorder the terms:
500 + 45x2 + -20x4 = -500 + 500 + -45x2 + 45x2 + 20x4 + -20x4

Combine like terms: -500 + 500 = 0
500 + 45x2 + -20x4 = 0 + -45x2 + 45x2 + 20x4 + -20x4
500 + 45x2 + -20x4 = -45x2 + 45x2 + 20x4 + -20x4

Combine like terms: -45x2 + 45x2 = 0
500 + 45x2 + -20x4 = 0 + 20x4 + -20x4
500 + 45x2 + -20x4 = 20x4 + -20x4

Combine like terms: 20x4 + -20x4 = 0
500 + 45x2 + -20x4 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(100 + 9x2 + -4x4) = 0

Factor a trinomial.
5((25 + -4x2)(4 + x2)) = 0

Factor a difference between two squares.
5(((5 + 2x)(5 + -2x))(4 + x2)) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(4 + x2)' equal to zero and attempt to solve: Simplifying 4 + x2 = 0 Solving 4 + x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x2 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x2 = 0 + -4 x2 = 0 + -4 Combine like terms: 0 + -4 = -4 x2 = -4 Simplifying x2 = -4 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 '(5 + 2x)' equal to zero and attempt to solve: Simplifying 5 + 2x = 0 Solving 5 + 2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 2x = 0 + -5 2x = 0 + -5 Combine like terms: 0 + -5 = -5 2x = -5 Divide each side by '2'. x = -2.5 Simplifying x = -2.5

Subproblem 3

Set the factor '(5 + -2x)' equal to zero and attempt to solve: Simplifying 5 + -2x = 0 Solving 5 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2x = 0 + -5 -2x = 0 + -5 Combine like terms: 0 + -5 = -5 -2x = -5 Divide each side by '-2'. x = 2.5 Simplifying x = 2.5

Solution

x = {-2.5, 2.5}

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