2x^4-7x^2-1=0

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Solution for 2x^4-7x^2-1=0 equation:


Simplifying
2x4 + -7x2 + -1 = 0

Reorder the terms:
-1 + -7x2 + 2x4 = 0

Solving
-1 + -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'.
-0.5 + -3.5x2 + x4 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -3.5x2 + 0.5 + x4 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -3.5x2 + x4 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -3.5x2 + x4 = 0 + 0.5
-3.5x2 + x4 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-3.5x2 + x4 = 0.5

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 = 0.5 + 3.0625

Reorder the terms:
3.0625 + -3.5x2 + x4 = 0.5 + 3.0625

Combine like terms: 0.5 + 3.0625 = 3.5625
3.0625 + -3.5x2 + x4 = 3.5625

Factor a perfect square on the left side:
(x2 + -1.75)(x2 + -1.75) = 3.5625

Calculate the square root of the right side: 1.887458609

Break this problem into two subproblems by setting 
(x2 + -1.75) equal to 1.887458609 and -1.887458609.

Subproblem 1

x2 + -1.75 = 1.887458609 Simplifying x2 + -1.75 = 1.887458609 Reorder the terms: -1.75 + x2 = 1.887458609 Solving -1.75 + x2 = 1.887458609 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 = 1.887458609 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x2 = 1.887458609 + 1.75 x2 = 1.887458609 + 1.75 Combine like terms: 1.887458609 + 1.75 = 3.637458609 x2 = 3.637458609 Simplifying x2 = 3.637458609 Take the square root of each side: x = {-1.907212261, 1.907212261}

Subproblem 2

x2 + -1.75 = -1.887458609 Simplifying x2 + -1.75 = -1.887458609 Reorder the terms: -1.75 + x2 = -1.887458609 Solving -1.75 + x2 = -1.887458609 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 = -1.887458609 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x2 = -1.887458609 + 1.75 x2 = -1.887458609 + 1.75 Combine like terms: -1.887458609 + 1.75 = -0.137458609 x2 = -0.137458609 Simplifying x2 = -0.137458609 Reorder the terms: 0.137458609 + x2 = -0.137458609 + 0.137458609 Combine like terms: -0.137458609 + 0.137458609 = 0.000000000 0.137458609 + 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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