16x^8-25x^4+9=0

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Solution for 16x^8-25x^4+9=0 equation:


Simplifying
16x8 + -25x4 + 9 = 0

Reorder the terms:
9 + -25x4 + 16x8 = 0

Solving
9 + -25x4 + 16x8 = 0

Solving for variable 'x'.

Factor a trinomial.
(9 + -16x4)(1 + -1x4) = 0

Factor a difference between two squares.
((3 + 4x2)(3 + -4x2))(1 + -1x4) = 0

Factor a difference between two squares.
((1 + x2)(1 + -1x2))(3 + 4x2)(3 + -4x2) = 0

Factor a difference between two squares.
((1 + x2)((1 + x)(1 + -1x)))(3 + 4x2)(3 + -4x2) = 0

Subproblem 1

Set the factor '(3 + 4x2)' equal to zero and attempt to solve: Simplifying 3 + 4x2 = 0 Solving 3 + 4x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4x2 = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 4x2 = 0 + -3 4x2 = 0 + -3 Combine like terms: 0 + -3 = -3 4x2 = -3 Divide each side by '4'. x2 = -0.75 Simplifying x2 = -0.75 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 '(3 + -4x2)' equal to zero and attempt to solve: Simplifying 3 + -4x2 = 0 Solving 3 + -4x2 = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -4x2 = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -4x2 = 0 + -3 -4x2 = 0 + -3 Combine like terms: 0 + -3 = -3 -4x2 = -3 Divide each side by '-4'. x2 = 0.75 Simplifying x2 = 0.75 Take the square root of each side: x = {-0.866025404, 0.866025404}

Subproblem 3

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

Subproblem 4

Set the factor '(1 + x)' equal to zero and attempt to solve: Simplifying 1 + x = 0 Solving 1 + x = 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 + x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0 + -1 x = 0 + -1 Combine like terms: 0 + -1 = -1 x = -1 Simplifying x = -1

Subproblem 5

Set the factor '(1 + -1x)' equal to zero and attempt to solve: Simplifying 1 + -1x = 0 Solving 1 + -1x = 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 + -1x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 0 + -1 -1x = 0 + -1 Combine like terms: 0 + -1 = -1 -1x = -1 Divide each side by '-1'. x = 1 Simplifying x = 1

Solution

x = {-0.866025404, 0.866025404, -1, 1}

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