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

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


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

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

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

Move the constant term to the right:

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

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

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

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

The x term is -0.4444444444x2.  Take half its coefficient (-0.2222222222).
Square it (0.04938271604) and add it to both sides.

Add '0.04938271604' to each side of the equation.
-0.4444444444x2 + 0.04938271604 + x4 = 0.3333333333 + 0.04938271604

Reorder the terms:
0.04938271604 + -0.4444444444x2 + x4 = 0.3333333333 + 0.04938271604

Combine like terms: 0.3333333333 + 0.04938271604 = 0.38271604934
0.04938271604 + -0.4444444444x2 + x4 = 0.38271604934

Factor a perfect square on the left side:
(x2 + -0.2222222222)(x2 + -0.2222222222) = 0.38271604934

Calculate the square root of the right side: 0.618640485

Break this problem into two subproblems by setting 
(x2 + -0.2222222222) equal to 0.618640485 and -0.618640485.

Subproblem 1

x2 + -0.2222222222 = 0.618640485 Simplifying x2 + -0.2222222222 = 0.618640485 Reorder the terms: -0.2222222222 + x2 = 0.618640485 Solving -0.2222222222 + x2 = 0.618640485 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2222222222' to each side of the equation. -0.2222222222 + 0.2222222222 + x2 = 0.618640485 + 0.2222222222 Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000 0.0000000000 + x2 = 0.618640485 + 0.2222222222 x2 = 0.618640485 + 0.2222222222 Combine like terms: 0.618640485 + 0.2222222222 = 0.8408627072 x2 = 0.8408627072 Simplifying x2 = 0.8408627072 Take the square root of each side: x = {-0.916985664, 0.916985664}

Subproblem 2

x2 + -0.2222222222 = -0.618640485 Simplifying x2 + -0.2222222222 = -0.618640485 Reorder the terms: -0.2222222222 + x2 = -0.618640485 Solving -0.2222222222 + x2 = -0.618640485 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2222222222' to each side of the equation. -0.2222222222 + 0.2222222222 + x2 = -0.618640485 + 0.2222222222 Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000 0.0000000000 + x2 = -0.618640485 + 0.2222222222 x2 = -0.618640485 + 0.2222222222 Combine like terms: -0.618640485 + 0.2222222222 = -0.3964182628 x2 = -0.3964182628 Simplifying x2 = -0.3964182628 Reorder the terms: 0.3964182628 + x2 = -0.3964182628 + 0.3964182628 Combine like terms: -0.3964182628 + 0.3964182628 = 0.0000000000 0.3964182628 + 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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