x^4+8x^2-11=0

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Solution for x^4+8x^2-11=0 equation:


Simplifying
x4 + 8x2 + -11 = 0

Reorder the terms:
-11 + 8x2 + x4 = 0

Solving
-11 + 8x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 8x2 + 11 + x4 = 0 + 11

Reorder the terms:
-11 + 11 + 8x2 + x4 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 8x2 + x4 = 0 + 11
8x2 + x4 = 0 + 11

Combine like terms: 0 + 11 = 11
8x2 + x4 = 11

The x term is 8x2.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x2 + 16 + x4 = 11 + 16

Reorder the terms:
16 + 8x2 + x4 = 11 + 16

Combine like terms: 11 + 16 = 27
16 + 8x2 + x4 = 27

Factor a perfect square on the left side:
(x2 + 4)(x2 + 4) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(x2 + 4) equal to 5.196152423 and -5.196152423.

Subproblem 1

x2 + 4 = 5.196152423 Simplifying x2 + 4 = 5.196152423 Reorder the terms: 4 + x2 = 5.196152423 Solving 4 + x2 = 5.196152423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x2 = 5.196152423 + -4 Combine like terms: 4 + -4 = 0 0 + x2 = 5.196152423 + -4 x2 = 5.196152423 + -4 Combine like terms: 5.196152423 + -4 = 1.196152423 x2 = 1.196152423 Simplifying x2 = 1.196152423 Take the square root of each side: x = {-1.093687534, 1.093687534}

Subproblem 2

x2 + 4 = -5.196152423 Simplifying x2 + 4 = -5.196152423 Reorder the terms: 4 + x2 = -5.196152423 Solving 4 + x2 = -5.196152423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x2 = -5.196152423 + -4 Combine like terms: 4 + -4 = 0 0 + x2 = -5.196152423 + -4 x2 = -5.196152423 + -4 Combine like terms: -5.196152423 + -4 = -9.196152423 x2 = -9.196152423 Simplifying x2 = -9.196152423 Reorder the terms: 9.196152423 + x2 = -9.196152423 + 9.196152423 Combine like terms: -9.196152423 + 9.196152423 = 0.000000000 9.196152423 + 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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