4x^4+21x^2-100=0

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Solution for 4x^4+21x^2-100=0 equation:


Simplifying
4x4 + 21x2 + -100 = 0

Reorder the terms:
-100 + 21x2 + 4x4 = 0

Solving
-100 + 21x2 + 4x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-25 + 5.25x2 + x4 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 5.25x2 + 25 + x4 = 0 + 25

Reorder the terms:
-25 + 25 + 5.25x2 + x4 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 5.25x2 + x4 = 0 + 25
5.25x2 + x4 = 0 + 25

Combine like terms: 0 + 25 = 25
5.25x2 + x4 = 25

The x term is 5.25x2.  Take half its coefficient (2.625).
Square it (6.890625) and add it to both sides.

Add '6.890625' to each side of the equation.
5.25x2 + 6.890625 + x4 = 25 + 6.890625

Reorder the terms:
6.890625 + 5.25x2 + x4 = 25 + 6.890625

Combine like terms: 25 + 6.890625 = 31.890625
6.890625 + 5.25x2 + x4 = 31.890625

Factor a perfect square on the left side:
(x2 + 2.625)(x2 + 2.625) = 31.890625

Calculate the square root of the right side: 5.647178499

Break this problem into two subproblems by setting 
(x2 + 2.625) equal to 5.647178499 and -5.647178499.

Subproblem 1

x2 + 2.625 = 5.647178499 Simplifying x2 + 2.625 = 5.647178499 Reorder the terms: 2.625 + x2 = 5.647178499 Solving 2.625 + x2 = 5.647178499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.625' to each side of the equation. 2.625 + -2.625 + x2 = 5.647178499 + -2.625 Combine like terms: 2.625 + -2.625 = 0.000 0.000 + x2 = 5.647178499 + -2.625 x2 = 5.647178499 + -2.625 Combine like terms: 5.647178499 + -2.625 = 3.022178499 x2 = 3.022178499 Simplifying x2 = 3.022178499 Take the square root of each side: x = {-1.738441399, 1.738441399}

Subproblem 2

x2 + 2.625 = -5.647178499 Simplifying x2 + 2.625 = -5.647178499 Reorder the terms: 2.625 + x2 = -5.647178499 Solving 2.625 + x2 = -5.647178499 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.625' to each side of the equation. 2.625 + -2.625 + x2 = -5.647178499 + -2.625 Combine like terms: 2.625 + -2.625 = 0.000 0.000 + x2 = -5.647178499 + -2.625 x2 = -5.647178499 + -2.625 Combine like terms: -5.647178499 + -2.625 = -8.272178499 x2 = -8.272178499 Simplifying x2 = -8.272178499 Reorder the terms: 8.272178499 + x2 = -8.272178499 + 8.272178499 Combine like terms: -8.272178499 + 8.272178499 = 0.000000000 8.272178499 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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