x^2(x^2-16)-81(x^2-16)=0

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Solution for x^2(x^2-16)-81(x^2-16)=0 equation:


Simplifying
x2(x2 + -16) + -81(x2 + -16) = 0

Reorder the terms:
x2(-16 + x2) + -81(x2 + -16) = 0
(-16 * x2 + x2 * x2) + -81(x2 + -16) = 0
(-16x2 + x4) + -81(x2 + -16) = 0

Reorder the terms:
-16x2 + x4 + -81(-16 + x2) = 0
-16x2 + x4 + (-16 * -81 + x2 * -81) = 0
-16x2 + x4 + (1296 + -81x2) = 0

Reorder the terms:
1296 + -16x2 + -81x2 + x4 = 0

Combine like terms: -16x2 + -81x2 = -97x2
1296 + -97x2 + x4 = 0

Solving
1296 + -97x2 + x4 = 0

Solving for variable 'x'.

Factor a trinomial.
(16 + -1x2)(81 + -1x2) = 0

Factor a difference between two squares.
((4 + x)(4 + -1x))(81 + -1x2) = 0

Factor a difference between two squares.
((9 + x)(9 + -1x))(4 + x)(4 + -1x) = 0

Subproblem 1

Set the factor '(4 + x)' equal to zero and attempt to solve: Simplifying 4 + x = 0 Solving 4 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0 + -4 x = 0 + -4 Combine like terms: 0 + -4 = -4 x = -4 Simplifying x = -4

Subproblem 2

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

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 = {-4, 4, -9, 9}

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