39x^4+34x^2-26=0

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Solution for 39x^4+34x^2-26=0 equation:


Simplifying
39x4 + 34x2 + -26 = 0

Reorder the terms:
-26 + 34x2 + 39x4 = 0

Solving
-26 + 34x2 + 39x4 = 0

Solving for variable 'x'.

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

Divide each side by '39'.
-0.6666666667 + 0.8717948718x2 + x4 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + 0.8717948718x2 + 0.6666666667 + x4 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + 0.8717948718x2 + x4 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + 0.8717948718x2 + x4 = 0 + 0.6666666667
0.8717948718x2 + x4 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
0.8717948718x2 + x4 = 0.6666666667

The x term is 0.8717948718x2.  Take half its coefficient (0.4358974359).
Square it (0.1900065746) and add it to both sides.

Add '0.1900065746' to each side of the equation.
0.8717948718x2 + 0.1900065746 + x4 = 0.6666666667 + 0.1900065746

Reorder the terms:
0.1900065746 + 0.8717948718x2 + x4 = 0.6666666667 + 0.1900065746

Combine like terms: 0.6666666667 + 0.1900065746 = 0.8566732413
0.1900065746 + 0.8717948718x2 + x4 = 0.8566732413

Factor a perfect square on the left side:
(x2 + 0.4358974359)(x2 + 0.4358974359) = 0.8566732413

Calculate the square root of the right side: 0.925566443

Break this problem into two subproblems by setting 
(x2 + 0.4358974359) equal to 0.925566443 and -0.925566443.

Subproblem 1

x2 + 0.4358974359 = 0.925566443 Simplifying x2 + 0.4358974359 = 0.925566443 Reorder the terms: 0.4358974359 + x2 = 0.925566443 Solving 0.4358974359 + x2 = 0.925566443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4358974359' to each side of the equation. 0.4358974359 + -0.4358974359 + x2 = 0.925566443 + -0.4358974359 Combine like terms: 0.4358974359 + -0.4358974359 = 0.0000000000 0.0000000000 + x2 = 0.925566443 + -0.4358974359 x2 = 0.925566443 + -0.4358974359 Combine like terms: 0.925566443 + -0.4358974359 = 0.4896690071 x2 = 0.4896690071 Simplifying x2 = 0.4896690071 Take the square root of each side: x = {-0.699763537, 0.699763537}

Subproblem 2

x2 + 0.4358974359 = -0.925566443 Simplifying x2 + 0.4358974359 = -0.925566443 Reorder the terms: 0.4358974359 + x2 = -0.925566443 Solving 0.4358974359 + x2 = -0.925566443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4358974359' to each side of the equation. 0.4358974359 + -0.4358974359 + x2 = -0.925566443 + -0.4358974359 Combine like terms: 0.4358974359 + -0.4358974359 = 0.0000000000 0.0000000000 + x2 = -0.925566443 + -0.4358974359 x2 = -0.925566443 + -0.4358974359 Combine like terms: -0.925566443 + -0.4358974359 = -1.3614638789 x2 = -1.3614638789 Simplifying x2 = -1.3614638789 Reorder the terms: 1.3614638789 + x2 = -1.3614638789 + 1.3614638789 Combine like terms: -1.3614638789 + 1.3614638789 = 0.0000000000 1.3614638789 + x2 = 0.0000000000 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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