x^4+30x^2=125

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Solution for x^4+30x^2=125 equation:


Simplifying
x4 + 30x2 = 125

Reorder the terms:
30x2 + x4 = 125

Solving
30x2 + x4 = 125

Solving for variable 'x'.

Reorder the terms:
-125 + 30x2 + x4 = 125 + -125

Combine like terms: 125 + -125 = 0
-125 + 30x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '125' to each side of the equation.
-125 + 30x2 + 125 + x4 = 0 + 125

Reorder the terms:
-125 + 125 + 30x2 + x4 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + 30x2 + x4 = 0 + 125
30x2 + x4 = 0 + 125

Combine like terms: 0 + 125 = 125
30x2 + x4 = 125

The x term is 30x2.  Take half its coefficient (15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
30x2 + 225 + x4 = 125 + 225

Reorder the terms:
225 + 30x2 + x4 = 125 + 225

Combine like terms: 125 + 225 = 350
225 + 30x2 + x4 = 350

Factor a perfect square on the left side:
(x2 + 15)(x2 + 15) = 350

Calculate the square root of the right side: 18.708286934

Break this problem into two subproblems by setting 
(x2 + 15) equal to 18.708286934 and -18.708286934.

Subproblem 1

x2 + 15 = 18.708286934 Simplifying x2 + 15 = 18.708286934 Reorder the terms: 15 + x2 = 18.708286934 Solving 15 + x2 = 18.708286934 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + x2 = 18.708286934 + -15 Combine like terms: 15 + -15 = 0 0 + x2 = 18.708286934 + -15 x2 = 18.708286934 + -15 Combine like terms: 18.708286934 + -15 = 3.708286934 x2 = 3.708286934 Simplifying x2 = 3.708286934 Take the square root of each side: x = {-1.925691287, 1.925691287}

Subproblem 2

x2 + 15 = -18.708286934 Simplifying x2 + 15 = -18.708286934 Reorder the terms: 15 + x2 = -18.708286934 Solving 15 + x2 = -18.708286934 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + x2 = -18.708286934 + -15 Combine like terms: 15 + -15 = 0 0 + x2 = -18.708286934 + -15 x2 = -18.708286934 + -15 Combine like terms: -18.708286934 + -15 = -33.708286934 x2 = -33.708286934 Simplifying x2 = -33.708286934 Reorder the terms: 33.708286934 + x2 = -33.708286934 + 33.708286934 Combine like terms: -33.708286934 + 33.708286934 = 0.000000000 33.708286934 + 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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