9x^4-3x^2-4=0

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Solution for 9x^4-3x^2-4=0 equation:


Simplifying
9x4 + -3x2 + -4 = 0

Reorder the terms:
-4 + -3x2 + 9x4 = 0

Solving
-4 + -3x2 + 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'.
-0.4444444444 + -0.3333333333x2 + x4 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + -0.3333333333x2 + 0.4444444444 + x4 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + -0.3333333333x2 + x4 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + -0.3333333333x2 + x4 = 0 + 0.4444444444
-0.3333333333x2 + x4 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
-0.3333333333x2 + x4 = 0.4444444444

The x term is -0.3333333333x2.  Take half its coefficient (-0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
-0.3333333333x2 + 0.02777777779 + x4 = 0.4444444444 + 0.02777777779

Reorder the terms:
0.02777777779 + -0.3333333333x2 + x4 = 0.4444444444 + 0.02777777779

Combine like terms: 0.4444444444 + 0.02777777779 = 0.47222222219
0.02777777779 + -0.3333333333x2 + x4 = 0.47222222219

Factor a perfect square on the left side:
(x2 + -0.1666666667)(x2 + -0.1666666667) = 0.47222222219

Calculate the square root of the right side: 0.687184271

Break this problem into two subproblems by setting 
(x2 + -0.1666666667) equal to 0.687184271 and -0.687184271.

Subproblem 1

x2 + -0.1666666667 = 0.687184271 Simplifying x2 + -0.1666666667 = 0.687184271 Reorder the terms: -0.1666666667 + x2 = 0.687184271 Solving -0.1666666667 + x2 = 0.687184271 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + x2 = 0.687184271 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + x2 = 0.687184271 + 0.1666666667 x2 = 0.687184271 + 0.1666666667 Combine like terms: 0.687184271 + 0.1666666667 = 0.8538509377 x2 = 0.8538509377 Simplifying x2 = 0.8538509377 Take the square root of each side: x = {-0.92404055, 0.92404055}

Subproblem 2

x2 + -0.1666666667 = -0.687184271 Simplifying x2 + -0.1666666667 = -0.687184271 Reorder the terms: -0.1666666667 + x2 = -0.687184271 Solving -0.1666666667 + x2 = -0.687184271 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1666666667' to each side of the equation. -0.1666666667 + 0.1666666667 + x2 = -0.687184271 + 0.1666666667 Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000 0.0000000000 + x2 = -0.687184271 + 0.1666666667 x2 = -0.687184271 + 0.1666666667 Combine like terms: -0.687184271 + 0.1666666667 = -0.5205176043 x2 = -0.5205176043 Simplifying x2 = -0.5205176043 Reorder the terms: 0.5205176043 + x2 = -0.5205176043 + 0.5205176043 Combine like terms: -0.5205176043 + 0.5205176043 = 0.0000000000 0.5205176043 + x2 = 0.0000000000 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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