x^2(x^2-4)-81(x^2-4)=0

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Solution for x^2(x^2-4)-81(x^2-4)=0 equation:


Simplifying
x2(x2 + -4) + -81(x2 + -4) = 0

Reorder the terms:
x2(-4 + x2) + -81(x2 + -4) = 0
(-4 * x2 + x2 * x2) + -81(x2 + -4) = 0
(-4x2 + x4) + -81(x2 + -4) = 0

Reorder the terms:
-4x2 + x4 + -81(-4 + x2) = 0
-4x2 + x4 + (-4 * -81 + x2 * -81) = 0
-4x2 + x4 + (324 + -81x2) = 0

Reorder the terms:
324 + -4x2 + -81x2 + x4 = 0

Combine like terms: -4x2 + -81x2 = -85x2
324 + -85x2 + x4 = 0

Solving
324 + -85x2 + x4 = 0

Solving for variable 'x'.

Factor a trinomial.
(4 + -1x2)(81 + -1x2) = 0

Factor a difference between two squares.
((2 + x)(2 + -1x))(81 + -1x2) = 0

Factor a difference between two squares.
((9 + x)(9 + -1x))(2 + x)(2 + -1x) = 0

Subproblem 1

Set the factor '(2 + x)' equal to zero and attempt to solve: Simplifying 2 + x = 0 Solving 2 + x = 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 + x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + x = 0 + -2 x = 0 + -2 Combine like terms: 0 + -2 = -2 x = -2 Simplifying x = -2

Subproblem 2

Set the factor '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 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 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2

Subproblem 3

Set the factor '(9 + x)' equal to zero and attempt to solve: Simplifying 9 + x = 0 Solving 9 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + x = 0 + -9 x = 0 + -9 Combine like terms: 0 + -9 = -9 x = -9 Simplifying x = -9

Subproblem 4

Set the factor '(9 + -1x)' equal to zero and attempt to solve: Simplifying 9 + -1x = 0 Solving 9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 0 + -9 -1x = 0 + -9 Combine like terms: 0 + -9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9

Solution

x = {-2, 2, -9, 9}

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