18x^5-21x^3=15x

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Solution for 18x^5-21x^3=15x equation:


Simplifying
18x5 + -21x3 = 15x

Reorder the terms:
-21x3 + 18x5 = 15x

Solving
-21x3 + 18x5 = 15x

Solving for variable 'x'.

Reorder the terms:
-15x + -21x3 + 18x5 = 15x + -15x

Combine like terms: 15x + -15x = 0
-15x + -21x3 + 18x5 = 0

Factor out the Greatest Common Factor (GCF), '3x'.
3x(-5 + -7x2 + 6x4) = 0

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

Ignore the factor 3.

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

Set the factor '(-1 + -2x2)' equal to zero and attempt to solve: Simplifying -1 + -2x2 = 0 Solving -1 + -2x2 = 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 + -2x2 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -2x2 = 0 + 1 -2x2 = 0 + 1 Combine like terms: 0 + 1 = 1 -2x2 = 1 Divide each side by '-2'. x2 = -0.5 Simplifying x2 = -0.5 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 3

Set the factor '(5 + -3x2)' equal to zero and attempt to solve: Simplifying 5 + -3x2 = 0 Solving 5 + -3x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -3x2 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -3x2 = 0 + -5 -3x2 = 0 + -5 Combine like terms: 0 + -5 = -5 -3x2 = -5 Divide each side by '-3'. x2 = 1.666666667 Simplifying x2 = 1.666666667 Take the square root of each side: x = {-1.290994449, 1.290994449}

Solution

x = {0, -1.290994449, 1.290994449}

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