0=15x^4-7x^2-2

Solution for 0=15x^4-7x^2-2 equation:

Simplifying
0 = 15x4 + -7x2 + -2

Reorder the terms:
0 = -2 + -7x2 + 15x4

Solving
0 = -2 + -7x2 + 15x4

Solving for variable 'x'.

Combine like terms: 0 + 2 = 2
2 + 7x2 + -15x4 = -2 + -7x2 + 15x4 + 2 + 7x2 + -15x4

Reorder the terms:
2 + 7x2 + -15x4 = -2 + 2 + -7x2 + 7x2 + 15x4 + -15x4

Combine like terms: -2 + 2 = 0
2 + 7x2 + -15x4 = 0 + -7x2 + 7x2 + 15x4 + -15x4
2 + 7x2 + -15x4 = -7x2 + 7x2 + 15x4 + -15x4

Combine like terms: -7x2 + 7x2 = 0
2 + 7x2 + -15x4 = 0 + 15x4 + -15x4
2 + 7x2 + -15x4 = 15x4 + -15x4

Combine like terms: 15x4 + -15x4 = 0
2 + 7x2 + -15x4 = 0

Factor a trinomial.
(2 + -3x2)(1 + 5x2) = 0

Subproblem 1
Set the factor '(2 + -3x2)' equal to zero and attempt to solve:

Simplifying
2 + -3x2 = 0

Solving
2 + -3x2 = 0

Move all terms containing x to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + -2 + -3x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3x2 = 0 + -2
-3x2 = 0 + -2

Combine like terms: 0 + -2 = -2
-3x2 = -2

Divide each side by '-3'.
x2 = 0.6666666667

Simplifying
x2 = 0.6666666667

Take the square root of each side:
x = {-0.816496581, 0.816496581}
Subproblem 2
Set the factor '(1 + 5x2)' equal to zero and attempt to solve:

Simplifying
1 + 5x2 = 0

Solving
1 + 5x2 = 0

Move all terms containing x to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + 5x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 5x2 = 0 + -1
5x2 = 0 + -1

Combine like terms: 0 + -1 = -1
5x2 = -1

Divide each side by '5'.
x2 = -0.2

Simplifying
x2 = -0.2

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.
Solution
x = {-0.816496581, 0.816496581}