8x^4+43x^2-5=0

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Solution for 8x^4+43x^2-5=0 equation:


Simplifying
8x4 + 43x2 + -5 = 0

Reorder the terms:
-5 + 43x2 + 8x4 = 0

Solving
-5 + 43x2 + 8x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-0.625 + 5.375x2 + x4 = 0

Move the constant term to the right:

Add '0.625' to each side of the equation.
-0.625 + 5.375x2 + 0.625 + x4 = 0 + 0.625

Reorder the terms:
-0.625 + 0.625 + 5.375x2 + x4 = 0 + 0.625

Combine like terms: -0.625 + 0.625 = 0.000
0.000 + 5.375x2 + x4 = 0 + 0.625
5.375x2 + x4 = 0 + 0.625

Combine like terms: 0 + 0.625 = 0.625
5.375x2 + x4 = 0.625

The x term is 5.375x2.  Take half its coefficient (2.6875).
Square it (7.22265625) and add it to both sides.

Add '7.22265625' to each side of the equation.
5.375x2 + 7.22265625 + x4 = 0.625 + 7.22265625

Reorder the terms:
7.22265625 + 5.375x2 + x4 = 0.625 + 7.22265625

Combine like terms: 0.625 + 7.22265625 = 7.84765625
7.22265625 + 5.375x2 + x4 = 7.84765625

Factor a perfect square on the left side:
(x2 + 2.6875)(x2 + 2.6875) = 7.84765625

Calculate the square root of the right side: 2.801366854

Break this problem into two subproblems by setting 
(x2 + 2.6875) equal to 2.801366854 and -2.801366854.

Subproblem 1

x2 + 2.6875 = 2.801366854 Simplifying x2 + 2.6875 = 2.801366854 Reorder the terms: 2.6875 + x2 = 2.801366854 Solving 2.6875 + x2 = 2.801366854 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.6875' to each side of the equation. 2.6875 + -2.6875 + x2 = 2.801366854 + -2.6875 Combine like terms: 2.6875 + -2.6875 = 0.0000 0.0000 + x2 = 2.801366854 + -2.6875 x2 = 2.801366854 + -2.6875 Combine like terms: 2.801366854 + -2.6875 = 0.113866854 x2 = 0.113866854 Simplifying x2 = 0.113866854 Take the square root of each side: x = {-0.337441631, 0.337441631}

Subproblem 2

x2 + 2.6875 = -2.801366854 Simplifying x2 + 2.6875 = -2.801366854 Reorder the terms: 2.6875 + x2 = -2.801366854 Solving 2.6875 + x2 = -2.801366854 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.6875' to each side of the equation. 2.6875 + -2.6875 + x2 = -2.801366854 + -2.6875 Combine like terms: 2.6875 + -2.6875 = 0.0000 0.0000 + x2 = -2.801366854 + -2.6875 x2 = -2.801366854 + -2.6875 Combine like terms: -2.801366854 + -2.6875 = -5.488866854 x2 = -5.488866854 Simplifying x2 = -5.488866854 Reorder the terms: 5.488866854 + x2 = -5.488866854 + 5.488866854 Combine like terms: -5.488866854 + 5.488866854 = 0.000000000 5.488866854 + x2 = 0.000000000 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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