X^4-10X^2-25=0

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Solution for X^4-10X^2-25=0 equation:


Simplifying
X4 + -10X2 + -25 = 0

Reorder the terms:
-25 + -10X2 + X4 = 0

Solving
-25 + -10X2 + X4 = 0

Solving for variable 'X'.

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -10X2 + 25 + X4 = 0 + 25

Reorder the terms:
-25 + 25 + -10X2 + X4 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -10X2 + X4 = 0 + 25
-10X2 + X4 = 0 + 25

Combine like terms: 0 + 25 = 25
-10X2 + X4 = 25

The X term is -10X2.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10X2 + 25 + X4 = 25 + 25

Reorder the terms:
25 + -10X2 + X4 = 25 + 25

Combine like terms: 25 + 25 = 50
25 + -10X2 + X4 = 50

Factor a perfect square on the left side:
(X2 + -5)(X2 + -5) = 50

Calculate the square root of the right side: 7.071067812

Break this problem into two subproblems by setting 
(X2 + -5) equal to 7.071067812 and -7.071067812.

Subproblem 1

X2 + -5 = 7.071067812 Simplifying X2 + -5 = 7.071067812 Reorder the terms: -5 + X2 = 7.071067812 Solving -5 + X2 = 7.071067812 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + X2 = 7.071067812 + 5 Combine like terms: -5 + 5 = 0 0 + X2 = 7.071067812 + 5 X2 = 7.071067812 + 5 Combine like terms: 7.071067812 + 5 = 12.071067812 X2 = 12.071067812 Simplifying X2 = 12.071067812 Take the square root of each side: X = {-3.474344228, 3.474344228}

Subproblem 2

X2 + -5 = -7.071067812 Simplifying X2 + -5 = -7.071067812 Reorder the terms: -5 + X2 = -7.071067812 Solving -5 + X2 = -7.071067812 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + X2 = -7.071067812 + 5 Combine like terms: -5 + 5 = 0 0 + X2 = -7.071067812 + 5 X2 = -7.071067812 + 5 Combine like terms: -7.071067812 + 5 = -2.071067812 X2 = -2.071067812 Simplifying X2 = -2.071067812 Reorder the terms: 2.071067812 + X2 = -2.071067812 + 2.071067812 Combine like terms: -2.071067812 + 2.071067812 = 0.000000000 2.071067812 + 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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