6x^4-9x^2-64=0

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Solution for 6x^4-9x^2-64=0 equation:


Simplifying
6x4 + -9x2 + -64 = 0

Reorder the terms:
-64 + -9x2 + 6x4 = 0

Solving
-64 + -9x2 + 6x4 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-10.66666667 + -1.5x2 + x4 = 0

Move the constant term to the right:

Add '10.66666667' to each side of the equation.
-10.66666667 + -1.5x2 + 10.66666667 + x4 = 0 + 10.66666667

Reorder the terms:
-10.66666667 + 10.66666667 + -1.5x2 + x4 = 0 + 10.66666667

Combine like terms: -10.66666667 + 10.66666667 = 0.00000000
0.00000000 + -1.5x2 + x4 = 0 + 10.66666667
-1.5x2 + x4 = 0 + 10.66666667

Combine like terms: 0 + 10.66666667 = 10.66666667
-1.5x2 + x4 = 10.66666667

The x term is -1.5x2.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x2 + 0.5625 + x4 = 10.66666667 + 0.5625

Reorder the terms:
0.5625 + -1.5x2 + x4 = 10.66666667 + 0.5625

Combine like terms: 10.66666667 + 0.5625 = 11.22916667
0.5625 + -1.5x2 + x4 = 11.22916667

Factor a perfect square on the left side:
(x2 + -0.75)(x2 + -0.75) = 11.22916667

Calculate the square root of the right side: 3.350994878

Break this problem into two subproblems by setting 
(x2 + -0.75) equal to 3.350994878 and -3.350994878.

Subproblem 1

x2 + -0.75 = 3.350994878 Simplifying x2 + -0.75 = 3.350994878 Reorder the terms: -0.75 + x2 = 3.350994878 Solving -0.75 + x2 = 3.350994878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x2 = 3.350994878 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x2 = 3.350994878 + 0.75 x2 = 3.350994878 + 0.75 Combine like terms: 3.350994878 + 0.75 = 4.100994878 x2 = 4.100994878 Simplifying x2 = 4.100994878 Take the square root of each side: x = {-2.025091326, 2.025091326}

Subproblem 2

x2 + -0.75 = -3.350994878 Simplifying x2 + -0.75 = -3.350994878 Reorder the terms: -0.75 + x2 = -3.350994878 Solving -0.75 + x2 = -3.350994878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x2 = -3.350994878 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x2 = -3.350994878 + 0.75 x2 = -3.350994878 + 0.75 Combine like terms: -3.350994878 + 0.75 = -2.600994878 x2 = -2.600994878 Simplifying x2 = -2.600994878 Reorder the terms: 2.600994878 + x2 = -2.600994878 + 2.600994878 Combine like terms: -2.600994878 + 2.600994878 = 0.000000000 2.600994878 + 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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