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

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


Simplifying
7x4 + -4x2 + -4 = 0

Reorder the terms:
-4 + -4x2 + 7x4 = 0

Solving
-4 + -4x2 + 7x4 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-0.5714285714 + -0.5714285714x2 + x4 = 0

Move the constant term to the right:

Add '0.5714285714' to each side of the equation.
-0.5714285714 + -0.5714285714x2 + 0.5714285714 + x4 = 0 + 0.5714285714

Reorder the terms:
-0.5714285714 + 0.5714285714 + -0.5714285714x2 + x4 = 0 + 0.5714285714

Combine like terms: -0.5714285714 + 0.5714285714 = 0.0000000000
0.0000000000 + -0.5714285714x2 + x4 = 0 + 0.5714285714
-0.5714285714x2 + x4 = 0 + 0.5714285714

Combine like terms: 0 + 0.5714285714 = 0.5714285714
-0.5714285714x2 + x4 = 0.5714285714

The x term is -0.5714285714x2.  Take half its coefficient (-0.2857142857).
Square it (0.08163265305) and add it to both sides.

Add '0.08163265305' to each side of the equation.
-0.5714285714x2 + 0.08163265305 + x4 = 0.5714285714 + 0.08163265305

Reorder the terms:
0.08163265305 + -0.5714285714x2 + x4 = 0.5714285714 + 0.08163265305

Combine like terms: 0.5714285714 + 0.08163265305 = 0.65306122445
0.08163265305 + -0.5714285714x2 + x4 = 0.65306122445

Factor a perfect square on the left side:
(x2 + -0.2857142857)(x2 + -0.2857142857) = 0.65306122445

Calculate the square root of the right side: 0.808122036

Break this problem into two subproblems by setting 
(x2 + -0.2857142857) equal to 0.808122036 and -0.808122036.

Subproblem 1

x2 + -0.2857142857 = 0.808122036 Simplifying x2 + -0.2857142857 = 0.808122036 Reorder the terms: -0.2857142857 + x2 = 0.808122036 Solving -0.2857142857 + x2 = 0.808122036 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2857142857' to each side of the equation. -0.2857142857 + 0.2857142857 + x2 = 0.808122036 + 0.2857142857 Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000 0.0000000000 + x2 = 0.808122036 + 0.2857142857 x2 = 0.808122036 + 0.2857142857 Combine like terms: 0.808122036 + 0.2857142857 = 1.0938363217 x2 = 1.0938363217 Simplifying x2 = 1.0938363217 Take the square root of each side: x = {-1.045866302, 1.045866302}

Subproblem 2

x2 + -0.2857142857 = -0.808122036 Simplifying x2 + -0.2857142857 = -0.808122036 Reorder the terms: -0.2857142857 + x2 = -0.808122036 Solving -0.2857142857 + x2 = -0.808122036 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2857142857' to each side of the equation. -0.2857142857 + 0.2857142857 + x2 = -0.808122036 + 0.2857142857 Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000 0.0000000000 + x2 = -0.808122036 + 0.2857142857 x2 = -0.808122036 + 0.2857142857 Combine like terms: -0.808122036 + 0.2857142857 = -0.5224077503 x2 = -0.5224077503 Simplifying x2 = -0.5224077503 Reorder the terms: 0.5224077503 + x2 = -0.5224077503 + 0.5224077503 Combine like terms: -0.5224077503 + 0.5224077503 = 0.0000000000 0.5224077503 + 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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