4x^4=13x^2+9

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Solution for 4x^4=13x^2+9 equation:


Simplifying
4x4 = 13x2 + 9

Reorder the terms:
4x4 = 9 + 13x2

Solving
4x4 = 9 + 13x2

Solving for variable 'x'.

Reorder the terms:
-9 + -13x2 + 4x4 = 9 + 13x2 + -9 + -13x2

Reorder the terms:
-9 + -13x2 + 4x4 = 9 + -9 + 13x2 + -13x2

Combine like terms: 9 + -9 = 0
-9 + -13x2 + 4x4 = 0 + 13x2 + -13x2
-9 + -13x2 + 4x4 = 13x2 + -13x2

Combine like terms: 13x2 + -13x2 = 0
-9 + -13x2 + 4x4 = 0

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

Divide each side by '4'.
-2.25 + -3.25x2 + x4 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -3.25x2 + 2.25 + x4 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + -3.25x2 + x4 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -3.25x2 + x4 = 0 + 2.25
-3.25x2 + x4 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
-3.25x2 + x4 = 2.25

The x term is -3.25x2.  Take half its coefficient (-1.625).
Square it (2.640625) and add it to both sides.

Add '2.640625' to each side of the equation.
-3.25x2 + 2.640625 + x4 = 2.25 + 2.640625

Reorder the terms:
2.640625 + -3.25x2 + x4 = 2.25 + 2.640625

Combine like terms: 2.25 + 2.640625 = 4.890625
2.640625 + -3.25x2 + x4 = 4.890625

Factor a perfect square on the left side:
(x2 + -1.625)(x2 + -1.625) = 4.890625

Calculate the square root of the right side: 2.211475752

Break this problem into two subproblems by setting 
(x2 + -1.625) equal to 2.211475752 and -2.211475752.

Subproblem 1

x2 + -1.625 = 2.211475752 Simplifying x2 + -1.625 = 2.211475752 Reorder the terms: -1.625 + x2 = 2.211475752 Solving -1.625 + x2 = 2.211475752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.625' to each side of the equation. -1.625 + 1.625 + x2 = 2.211475752 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + x2 = 2.211475752 + 1.625 x2 = 2.211475752 + 1.625 Combine like terms: 2.211475752 + 1.625 = 3.836475752 x2 = 3.836475752 Simplifying x2 = 3.836475752 Take the square root of each side: x = {-1.958692358, 1.958692358}

Subproblem 2

x2 + -1.625 = -2.211475752 Simplifying x2 + -1.625 = -2.211475752 Reorder the terms: -1.625 + x2 = -2.211475752 Solving -1.625 + x2 = -2.211475752 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.625' to each side of the equation. -1.625 + 1.625 + x2 = -2.211475752 + 1.625 Combine like terms: -1.625 + 1.625 = 0.000 0.000 + x2 = -2.211475752 + 1.625 x2 = -2.211475752 + 1.625 Combine like terms: -2.211475752 + 1.625 = -0.586475752 x2 = -0.586475752 Simplifying x2 = -0.586475752 Reorder the terms: 0.586475752 + x2 = -0.586475752 + 0.586475752 Combine like terms: -0.586475752 + 0.586475752 = 0.000000000 0.586475752 + 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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