9x^4+x^2-100=0

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Solution for 9x^4+x^2-100=0 equation:


Simplifying
9x4 + x2 + -100 = 0

Reorder the terms:
-100 + x2 + 9x4 = 0

Solving
-100 + x2 + 9x4 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-11.11111111 + 0.1111111111x2 + x4 = 0

Move the constant term to the right:

Add '11.11111111' to each side of the equation.
-11.11111111 + 0.1111111111x2 + 11.11111111 + x4 = 0 + 11.11111111

Reorder the terms:
-11.11111111 + 11.11111111 + 0.1111111111x2 + x4 = 0 + 11.11111111

Combine like terms: -11.11111111 + 11.11111111 = 0.00000000
0.00000000 + 0.1111111111x2 + x4 = 0 + 11.11111111
0.1111111111x2 + x4 = 0 + 11.11111111

Combine like terms: 0 + 11.11111111 = 11.11111111
0.1111111111x2 + x4 = 11.11111111

The x term is x2.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.1111111111x2 + 0.25 + x4 = 11.11111111 + 0.25

Reorder the terms:
0.25 + 0.1111111111x2 + x4 = 11.11111111 + 0.25

Combine like terms: 11.11111111 + 0.25 = 11.36111111
0.25 + 0.1111111111x2 + x4 = 11.36111111

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 11.36111111

Calculate the square root of the right side: 3.370624736

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 3.370624736 and -3.370624736.

Subproblem 1

x2 + 0.5 = 3.370624736 Simplifying x2 + 0.5 = 3.370624736 Reorder the terms: 0.5 + x2 = 3.370624736 Solving 0.5 + x2 = 3.370624736 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = 3.370624736 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 3.370624736 + -0.5 x2 = 3.370624736 + -0.5 Combine like terms: 3.370624736 + -0.5 = 2.870624736 x2 = 2.870624736 Simplifying x2 = 2.870624736 Take the square root of each side: x = {-1.69429181, 1.69429181}

Subproblem 2

x2 + 0.5 = -3.370624736 Simplifying x2 + 0.5 = -3.370624736 Reorder the terms: 0.5 + x2 = -3.370624736 Solving 0.5 + x2 = -3.370624736 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = -3.370624736 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -3.370624736 + -0.5 x2 = -3.370624736 + -0.5 Combine like terms: -3.370624736 + -0.5 = -3.870624736 x2 = -3.870624736 Simplifying x2 = -3.870624736 Reorder the terms: 3.870624736 + x2 = -3.870624736 + 3.870624736 Combine like terms: -3.870624736 + 3.870624736 = 0.000000000 3.870624736 + 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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