x^2(x^2-81)-25(x^2-81)=0

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Solution for x^2(x^2-81)-25(x^2-81)=0 equation:


Simplifying
x2(x2 + -81) + -25(x2 + -81) = 0

Reorder the terms:
x2(-81 + x2) + -25(x2 + -81) = 0
(-81 * x2 + x2 * x2) + -25(x2 + -81) = 0
(-81x2 + x4) + -25(x2 + -81) = 0

Reorder the terms:
-81x2 + x4 + -25(-81 + x2) = 0
-81x2 + x4 + (-81 * -25 + x2 * -25) = 0
-81x2 + x4 + (2025 + -25x2) = 0

Reorder the terms:
2025 + -81x2 + -25x2 + x4 = 0

Combine like terms: -81x2 + -25x2 = -106x2
2025 + -106x2 + x4 = 0

Solving
2025 + -106x2 + x4 = 0

Solving for variable 'x'.

Factor a trinomial.
(25 + -1x2)(81 + -1x2) = 0

Factor a difference between two squares.
((5 + x)(5 + -1x))(81 + -1x2) = 0

Factor a difference between two squares.
((9 + x)(9 + -1x))(5 + x)(5 + -1x) = 0

Subproblem 1

Set the factor '(5 + x)' equal to zero and attempt to solve: Simplifying 5 + x = 0 Solving 5 + x = 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 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5 Combine like terms: 0 + -5 = -5 x = -5 Simplifying x = -5

Subproblem 2

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 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 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

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 = {-5, 5, -9, 9}

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