15x^4+15x^2-8=0

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Solution for 15x^4+15x^2-8=0 equation:


Simplifying
15x4 + 15x2 + -8 = 0

Reorder the terms:
-8 + 15x2 + 15x4 = 0

Solving
-8 + 15x2 + 15x4 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-0.5333333333 + x2 + x4 = 0

Move the constant term to the right:

Add '0.5333333333' to each side of the equation.
-0.5333333333 + x2 + 0.5333333333 + x4 = 0 + 0.5333333333

Reorder the terms:
-0.5333333333 + 0.5333333333 + x2 + x4 = 0 + 0.5333333333

Combine like terms: -0.5333333333 + 0.5333333333 = 0.0000000000
0.0000000000 + x2 + x4 = 0 + 0.5333333333
x2 + x4 = 0 + 0.5333333333

Combine like terms: 0 + 0.5333333333 = 0.5333333333
x2 + x4 = 0.5333333333

The x term is x2.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x4 = 0.5333333333 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x4 = 0.5333333333 + 0.25

Combine like terms: 0.5333333333 + 0.25 = 0.7833333333
1.25 + x4 = 0.7833333333

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 0.7833333333

Calculate the square root of the right side: 0.885061203

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 0.885061203 and -0.885061203.

Subproblem 1

x2 + 0.5 = 0.885061203 Simplifying x2 + 0.5 = 0.885061203 Reorder the terms: 0.5 + x2 = 0.885061203 Solving 0.5 + x2 = 0.885061203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = 0.885061203 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 0.885061203 + -0.5 x2 = 0.885061203 + -0.5 Combine like terms: 0.885061203 + -0.5 = 0.385061203 x2 = 0.385061203 Simplifying x2 = 0.385061203 Take the square root of each side: x = {-0.620532999, 0.620532999}

Subproblem 2

x2 + 0.5 = -0.885061203 Simplifying x2 + 0.5 = -0.885061203 Reorder the terms: 0.5 + x2 = -0.885061203 Solving 0.5 + x2 = -0.885061203 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = -0.885061203 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -0.885061203 + -0.5 x2 = -0.885061203 + -0.5 Combine like terms: -0.885061203 + -0.5 = -1.385061203 x2 = -1.385061203 Simplifying x2 = -1.385061203 Reorder the terms: 1.385061203 + x2 = -1.385061203 + 1.385061203 Combine like terms: -1.385061203 + 1.385061203 = 0.000000000 1.385061203 + 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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