9x^4=13x^2+4

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


Simplifying
9x4 = 13x2 + 4

Reorder the terms:
9x4 = 4 + 13x2

Solving
9x4 = 4 + 13x2

Solving for variable 'x'.

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

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

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

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

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

Divide each side by '9'.
-0.4444444444 + -1.444444444x2 + x4 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + -1.444444444x2 + 0.4444444444 + x4 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + -1.444444444x2 + x4 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + -1.444444444x2 + x4 = 0 + 0.4444444444
-1.444444444x2 + x4 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
-1.444444444x2 + x4 = 0.4444444444

The x term is -1.444444444x2.  Take half its coefficient (-0.722222222).
Square it (0.5216049380) and add it to both sides.

Add '0.5216049380' to each side of the equation.
-1.444444444x2 + 0.5216049380 + x4 = 0.4444444444 + 0.5216049380

Reorder the terms:
0.5216049380 + -1.444444444x2 + x4 = 0.4444444444 + 0.5216049380

Combine like terms: 0.4444444444 + 0.5216049380 = 0.9660493824
0.5216049380 + -1.444444444x2 + x4 = 0.9660493824

Factor a perfect square on the left side:
(x2 + -0.722222222)(x2 + -0.722222222) = 0.9660493824

Calculate the square root of the right side: 0.982878112

Break this problem into two subproblems by setting 
(x2 + -0.722222222) equal to 0.982878112 and -0.982878112.

Subproblem 1

x2 + -0.722222222 = 0.982878112 Simplifying x2 + -0.722222222 = 0.982878112 Reorder the terms: -0.722222222 + x2 = 0.982878112 Solving -0.722222222 + x2 = 0.982878112 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.722222222' to each side of the equation. -0.722222222 + 0.722222222 + x2 = 0.982878112 + 0.722222222 Combine like terms: -0.722222222 + 0.722222222 = 0.000000000 0.000000000 + x2 = 0.982878112 + 0.722222222 x2 = 0.982878112 + 0.722222222 Combine like terms: 0.982878112 + 0.722222222 = 1.705100334 x2 = 1.705100334 Simplifying x2 = 1.705100334 Take the square root of each side: x = {-1.305794905, 1.305794905}

Subproblem 2

x2 + -0.722222222 = -0.982878112 Simplifying x2 + -0.722222222 = -0.982878112 Reorder the terms: -0.722222222 + x2 = -0.982878112 Solving -0.722222222 + x2 = -0.982878112 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.722222222' to each side of the equation. -0.722222222 + 0.722222222 + x2 = -0.982878112 + 0.722222222 Combine like terms: -0.722222222 + 0.722222222 = 0.000000000 0.000000000 + x2 = -0.982878112 + 0.722222222 x2 = -0.982878112 + 0.722222222 Combine like terms: -0.982878112 + 0.722222222 = -0.26065589 x2 = -0.26065589 Simplifying x2 = -0.26065589 Reorder the terms: 0.26065589 + x2 = -0.26065589 + 0.26065589 Combine like terms: -0.26065589 + 0.26065589 = 0.00000000 0.26065589 + 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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