3.2x^4-1.5x^2-2.1=0

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Solution for 3.2x^4-1.5x^2-2.1=0 equation:


Simplifying
3.2x4 + -1.5x2 + -2.1 = 0

Reorder the terms:
-2.1 + -1.5x2 + 3.2x4 = 0

Solving
-2.1 + -1.5x2 + 3.2x4 = 0

Solving for variable 'x'.

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

Divide each side by '3.2'.
-0.65625 + -0.46875x2 + x4 = 0

Move the constant term to the right:

Add '0.65625' to each side of the equation.
-0.65625 + -0.46875x2 + 0.65625 + x4 = 0 + 0.65625

Reorder the terms:
-0.65625 + 0.65625 + -0.46875x2 + x4 = 0 + 0.65625

Combine like terms: -0.65625 + 0.65625 = 0.00000
0.00000 + -0.46875x2 + x4 = 0 + 0.65625
-0.46875x2 + x4 = 0 + 0.65625

Combine like terms: 0 + 0.65625 = 0.65625
-0.46875x2 + x4 = 0.65625

The x term is -0.46875x2.  Take half its coefficient (-0.234375).
Square it (0.05493164063) and add it to both sides.

Add '0.05493164063' to each side of the equation.
-0.46875x2 + 0.05493164063 + x4 = 0.65625 + 0.05493164063

Reorder the terms:
0.05493164063 + -0.46875x2 + x4 = 0.65625 + 0.05493164063

Combine like terms: 0.65625 + 0.05493164063 = 0.71118164063
0.05493164063 + -0.46875x2 + x4 = 0.71118164063

Factor a perfect square on the left side:
(x2 + -0.234375)(x2 + -0.234375) = 0.71118164063

Calculate the square root of the right side: 0.843315861

Break this problem into two subproblems by setting 
(x2 + -0.234375) equal to 0.843315861 and -0.843315861.

Subproblem 1

x2 + -0.234375 = 0.843315861 Simplifying x2 + -0.234375 = 0.843315861 Reorder the terms: -0.234375 + x2 = 0.843315861 Solving -0.234375 + x2 = 0.843315861 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.234375' to each side of the equation. -0.234375 + 0.234375 + x2 = 0.843315861 + 0.234375 Combine like terms: -0.234375 + 0.234375 = 0.000000 0.000000 + x2 = 0.843315861 + 0.234375 x2 = 0.843315861 + 0.234375 Combine like terms: 0.843315861 + 0.234375 = 1.077690861 x2 = 1.077690861 Simplifying x2 = 1.077690861 Take the square root of each side: x = {-1.038118905, 1.038118905}

Subproblem 2

x2 + -0.234375 = -0.843315861 Simplifying x2 + -0.234375 = -0.843315861 Reorder the terms: -0.234375 + x2 = -0.843315861 Solving -0.234375 + x2 = -0.843315861 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.234375' to each side of the equation. -0.234375 + 0.234375 + x2 = -0.843315861 + 0.234375 Combine like terms: -0.234375 + 0.234375 = 0.000000 0.000000 + x2 = -0.843315861 + 0.234375 x2 = -0.843315861 + 0.234375 Combine like terms: -0.843315861 + 0.234375 = -0.608940861 x2 = -0.608940861 Simplifying x2 = -0.608940861 Reorder the terms: 0.608940861 + x2 = -0.608940861 + 0.608940861 Combine like terms: -0.608940861 + 0.608940861 = 0.000000000 0.608940861 + 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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