2x^4-9x^2-16=0

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Solution for 2x^4-9x^2-16=0 equation:


Simplifying
2x4 + -9x2 + -16 = 0

Reorder the terms:
-16 + -9x2 + 2x4 = 0

Solving
-16 + -9x2 + 2x4 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-8 + -4.5x2 + x4 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -4.5x2 + 8 + x4 = 0 + 8

Reorder the terms:
-8 + 8 + -4.5x2 + x4 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -4.5x2 + x4 = 0 + 8
-4.5x2 + x4 = 0 + 8

Combine like terms: 0 + 8 = 8
-4.5x2 + x4 = 8

The x term is -4.5x2.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x2 + 5.0625 + x4 = 8 + 5.0625

Reorder the terms:
5.0625 + -4.5x2 + x4 = 8 + 5.0625

Combine like terms: 8 + 5.0625 = 13.0625
5.0625 + -4.5x2 + x4 = 13.0625

Factor a perfect square on the left side:
(x2 + -2.25)(x2 + -2.25) = 13.0625

Calculate the square root of the right side: 3.614208074

Break this problem into two subproblems by setting 
(x2 + -2.25) equal to 3.614208074 and -3.614208074.

Subproblem 1

x2 + -2.25 = 3.614208074 Simplifying x2 + -2.25 = 3.614208074 Reorder the terms: -2.25 + x2 = 3.614208074 Solving -2.25 + x2 = 3.614208074 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x2 = 3.614208074 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x2 = 3.614208074 + 2.25 x2 = 3.614208074 + 2.25 Combine like terms: 3.614208074 + 2.25 = 5.864208074 x2 = 5.864208074 Simplifying x2 = 5.864208074 Take the square root of each side: x = {-2.421612701, 2.421612701}

Subproblem 2

x2 + -2.25 = -3.614208074 Simplifying x2 + -2.25 = -3.614208074 Reorder the terms: -2.25 + x2 = -3.614208074 Solving -2.25 + x2 = -3.614208074 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x2 = -3.614208074 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x2 = -3.614208074 + 2.25 x2 = -3.614208074 + 2.25 Combine like terms: -3.614208074 + 2.25 = -1.364208074 x2 = -1.364208074 Simplifying x2 = -1.364208074 Reorder the terms: 1.364208074 + x2 = -1.364208074 + 1.364208074 Combine like terms: -1.364208074 + 1.364208074 = 0.000000000 1.364208074 + 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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