4x^4+11x^2-5=0

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Solution for 4x^4+11x^2-5=0 equation:


Simplifying
4x4 + 11x2 + -5 = 0

Reorder the terms:
-5 + 11x2 + 4x4 = 0

Solving
-5 + 11x2 + 4x4 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-1.25 + 2.75x2 + x4 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 2.75x2 + 1.25 + x4 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 2.75x2 + x4 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 2.75x2 + x4 = 0 + 1.25
2.75x2 + x4 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
2.75x2 + x4 = 1.25

The x term is 2.75x2.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75x2 + 1.890625 + x4 = 1.25 + 1.890625

Reorder the terms:
1.890625 + 2.75x2 + x4 = 1.25 + 1.890625

Combine like terms: 1.25 + 1.890625 = 3.140625
1.890625 + 2.75x2 + x4 = 3.140625

Factor a perfect square on the left side:
(x2 + 1.375)(x2 + 1.375) = 3.140625

Calculate the square root of the right side: 1.77218086

Break this problem into two subproblems by setting 
(x2 + 1.375) equal to 1.77218086 and -1.77218086.

Subproblem 1

x2 + 1.375 = 1.77218086 Simplifying x2 + 1.375 = 1.77218086 Reorder the terms: 1.375 + x2 = 1.77218086 Solving 1.375 + x2 = 1.77218086 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x2 = 1.77218086 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x2 = 1.77218086 + -1.375 x2 = 1.77218086 + -1.375 Combine like terms: 1.77218086 + -1.375 = 0.39718086 x2 = 0.39718086 Simplifying x2 = 0.39718086 Take the square root of each side: x = {-0.630222865, 0.630222865}

Subproblem 2

x2 + 1.375 = -1.77218086 Simplifying x2 + 1.375 = -1.77218086 Reorder the terms: 1.375 + x2 = -1.77218086 Solving 1.375 + x2 = -1.77218086 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x2 = -1.77218086 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x2 = -1.77218086 + -1.375 x2 = -1.77218086 + -1.375 Combine like terms: -1.77218086 + -1.375 = -3.14718086 x2 = -3.14718086 Simplifying x2 = -3.14718086 Reorder the terms: 3.14718086 + x2 = -3.14718086 + 3.14718086 Combine like terms: -3.14718086 + 3.14718086 = 0.00000000 3.14718086 + x2 = 0.00000000 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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