x^4-100x^2+9=0

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Solution for x^4-100x^2+9=0 equation:


Simplifying
x4 + -100x2 + 9 = 0

Reorder the terms:
9 + -100x2 + x4 = 0

Solving
9 + -100x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -100x2 + -9 + x4 = 0 + -9

Reorder the terms:
9 + -9 + -100x2 + x4 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -100x2 + x4 = 0 + -9
-100x2 + x4 = 0 + -9

Combine like terms: 0 + -9 = -9
-100x2 + x4 = -9

The x term is -100x2.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100x2 + 2500 + x4 = -9 + 2500

Reorder the terms:
2500 + -100x2 + x4 = -9 + 2500

Combine like terms: -9 + 2500 = 2491
2500 + -100x2 + x4 = 2491

Factor a perfect square on the left side:
(x2 + -50)(x2 + -50) = 2491

Calculate the square root of the right side: 49.909918854

Break this problem into two subproblems by setting 
(x2 + -50) equal to 49.909918854 and -49.909918854.

Subproblem 1

x2 + -50 = 49.909918854 Simplifying x2 + -50 = 49.909918854 Reorder the terms: -50 + x2 = 49.909918854 Solving -50 + x2 = 49.909918854 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x2 = 49.909918854 + 50 Combine like terms: -50 + 50 = 0 0 + x2 = 49.909918854 + 50 x2 = 49.909918854 + 50 Combine like terms: 49.909918854 + 50 = 99.909918854 x2 = 99.909918854 Simplifying x2 = 99.909918854 Take the square root of each side: x = {-9.995494928, 9.995494928}

Subproblem 2

x2 + -50 = -49.909918854 Simplifying x2 + -50 = -49.909918854 Reorder the terms: -50 + x2 = -49.909918854 Solving -50 + x2 = -49.909918854 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x2 = -49.909918854 + 50 Combine like terms: -50 + 50 = 0 0 + x2 = -49.909918854 + 50 x2 = -49.909918854 + 50 Combine like terms: -49.909918854 + 50 = 0.090081146 x2 = 0.090081146 Simplifying x2 = 0.090081146 Take the square root of each side: x = {-0.300135213, 0.300135213}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-9.995494928, 9.995494928, -0.300135213, 0.300135213}

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