20x^4-11x^2=2

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Solution for 20x^4-11x^2=2 equation:


Simplifying
20x4 + -11x2 = 2

Reorder the terms:
-11x2 + 20x4 = 2

Solving
-11x2 + 20x4 = 2

Solving for variable 'x'.

Reorder the terms:
-2 + -11x2 + 20x4 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + -11x2 + 20x4 = 0

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

Divide each side by '20'.
-0.1 + -0.55x2 + x4 = 0

Move the constant term to the right:

Add '0.1' to each side of the equation.
-0.1 + -0.55x2 + 0.1 + x4 = 0 + 0.1

Reorder the terms:
-0.1 + 0.1 + -0.55x2 + x4 = 0 + 0.1

Combine like terms: -0.1 + 0.1 = 0.0
0.0 + -0.55x2 + x4 = 0 + 0.1
-0.55x2 + x4 = 0 + 0.1

Combine like terms: 0 + 0.1 = 0.1
-0.55x2 + x4 = 0.1

The x term is -0.55x2.  Take half its coefficient (-0.275).
Square it (0.075625) and add it to both sides.

Add '0.075625' to each side of the equation.
-0.55x2 + 0.075625 + x4 = 0.1 + 0.075625

Reorder the terms:
0.075625 + -0.55x2 + x4 = 0.1 + 0.075625

Combine like terms: 0.1 + 0.075625 = 0.175625
0.075625 + -0.55x2 + x4 = 0.175625

Factor a perfect square on the left side:
(x2 + -0.275)(x2 + -0.275) = 0.175625

Calculate the square root of the right side: 0.419076365

Break this problem into two subproblems by setting 
(x2 + -0.275) equal to 0.419076365 and -0.419076365.

Subproblem 1

x2 + -0.275 = 0.419076365 Simplifying x2 + -0.275 = 0.419076365 Reorder the terms: -0.275 + x2 = 0.419076365 Solving -0.275 + x2 = 0.419076365 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.275' to each side of the equation. -0.275 + 0.275 + x2 = 0.419076365 + 0.275 Combine like terms: -0.275 + 0.275 = 0.000 0.000 + x2 = 0.419076365 + 0.275 x2 = 0.419076365 + 0.275 Combine like terms: 0.419076365 + 0.275 = 0.694076365 x2 = 0.694076365 Simplifying x2 = 0.694076365 Take the square root of each side: x = {-0.833112456, 0.833112456}

Subproblem 2

x2 + -0.275 = -0.419076365 Simplifying x2 + -0.275 = -0.419076365 Reorder the terms: -0.275 + x2 = -0.419076365 Solving -0.275 + x2 = -0.419076365 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.275' to each side of the equation. -0.275 + 0.275 + x2 = -0.419076365 + 0.275 Combine like terms: -0.275 + 0.275 = 0.000 0.000 + x2 = -0.419076365 + 0.275 x2 = -0.419076365 + 0.275 Combine like terms: -0.419076365 + 0.275 = -0.144076365 x2 = -0.144076365 Simplifying x2 = -0.144076365 Reorder the terms: 0.144076365 + x2 = -0.144076365 + 0.144076365 Combine like terms: -0.144076365 + 0.144076365 = 0.000000000 0.144076365 + 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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