2x^4+7x^2-3=0

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Solution for 2x^4+7x^2-3=0 equation:


Simplifying
2x4 + 7x2 + -3 = 0

Reorder the terms:
-3 + 7x2 + 2x4 = 0

Solving
-3 + 7x2 + 2x4 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-1.5 + 3.5x2 + x4 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 3.5x2 + 1.5 + x4 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 3.5x2 + x4 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 3.5x2 + x4 = 0 + 1.5
3.5x2 + x4 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
3.5x2 + x4 = 1.5

The x term is 3.5x2.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x2 + 3.0625 + x4 = 1.5 + 3.0625

Reorder the terms:
3.0625 + 3.5x2 + x4 = 1.5 + 3.0625

Combine like terms: 1.5 + 3.0625 = 4.5625
3.0625 + 3.5x2 + x4 = 4.5625

Factor a perfect square on the left side:
(x2 + 1.75)(x2 + 1.75) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(x2 + 1.75) equal to 2.136000936 and -2.136000936.

Subproblem 1

x2 + 1.75 = 2.136000936 Simplifying x2 + 1.75 = 2.136000936 Reorder the terms: 1.75 + x2 = 2.136000936 Solving 1.75 + x2 = 2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x2 = 2.136000936 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x2 = 2.136000936 + -1.75 x2 = 2.136000936 + -1.75 Combine like terms: 2.136000936 + -1.75 = 0.386000936 x2 = 0.386000936 Simplifying x2 = 0.386000936 Take the square root of each side: x = {-0.621289736, 0.621289736}

Subproblem 2

x2 + 1.75 = -2.136000936 Simplifying x2 + 1.75 = -2.136000936 Reorder the terms: 1.75 + x2 = -2.136000936 Solving 1.75 + x2 = -2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x2 = -2.136000936 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x2 = -2.136000936 + -1.75 x2 = -2.136000936 + -1.75 Combine like terms: -2.136000936 + -1.75 = -3.886000936 x2 = -3.886000936 Simplifying x2 = -3.886000936 Reorder the terms: 3.886000936 + x2 = -3.886000936 + 3.886000936 Combine like terms: -3.886000936 + 3.886000936 = 0.000000000 3.886000936 + 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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