625x^4-81=0

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Solution for 625x^4-81=0 equation:


Simplifying
625x4 + -81 = 0

Reorder the terms:
-81 + 625x4 = 0

Solving
-81 + 625x4 = 0

Solving for variable 'x'.

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

Add '81' to each side of the equation.
-81 + 81 + 625x4 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + 625x4 = 0 + 81
625x4 = 0 + 81

Combine like terms: 0 + 81 = 81
625x4 = 81

Divide each side by '625'.
x4 = 0.1296

Simplifying
x4 = 0.1296

Reorder the terms:
-0.1296 + x4 = 0.1296 + -0.1296

Combine like terms: 0.1296 + -0.1296 = 0.0000
-0.1296 + x4 = 0.0000

Factor a difference between two squares.
(0.36 + x2)(-0.36 + x2) = 0.0000

Factor a difference between two squares.
(0.36 + x2)((0.6 + x)(-0.6 + x)) = 0.0000

Subproblem 1

Set the factor '(0.36 + x2)' equal to zero and attempt to solve: Simplifying 0.36 + x2 = 0 Solving 0.36 + x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-0.36' to each side of the equation. 0.36 + -0.36 + x2 = 0 + -0.36 Combine like terms: 0.36 + -0.36 = 0.00 0.00 + x2 = 0 + -0.36 x2 = 0 + -0.36 Combine like terms: 0 + -0.36 = -0.36 x2 = -0.36 Simplifying x2 = -0.36 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(0.6 + x)' equal to zero and attempt to solve: Simplifying 0.6 + x = 0 Solving 0.6 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = 0 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = 0 + -0.6 x = 0 + -0.6 Combine like terms: 0 + -0.6 = -0.6 x = -0.6 Simplifying x = -0.6

Subproblem 3

Set the factor '(-0.6 + x)' equal to zero and attempt to solve: Simplifying -0.6 + x = 0 Solving -0.6 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 0 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 0 + 0.6 x = 0 + 0.6 Combine like terms: 0 + 0.6 = 0.6 x = 0.6 Simplifying x = 0.6

Solution

x = {-0.6, 0.6}

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