8=0.5x^4+3x^2

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Solution for 8=0.5x^4+3x^2 equation:


Simplifying
8 = 0.5x4 + 3x2

Reorder the terms:
8 = 3x2 + 0.5x4

Solving
8 = 3x2 + 0.5x4

Solving for variable 'x'.

Reorder the terms:
8 + -3x2 + -0.5x4 = 3x2 + -3x2 + 0.5x4 + -0.5x4

Combine like terms: 3x2 + -3x2 = 0
8 + -3x2 + -0.5x4 = 0 + 0.5x4 + -0.5x4
8 + -3x2 + -0.5x4 = 0.5x4 + -0.5x4

Combine like terms: 0.5x4 + -0.5x4 = 0.0
8 + -3x2 + -0.5x4 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-16 + 6x2 + x4 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 6x2 + 16 + x4 = 0 + 16

Reorder the terms:
-16 + 16 + 6x2 + x4 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 6x2 + x4 = 0 + 16
6x2 + x4 = 0 + 16

Combine like terms: 0 + 16 = 16
6x2 + x4 = 16

The x term is 6x2.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x2 + 9 + x4 = 16 + 9

Reorder the terms:
9 + 6x2 + x4 = 16 + 9

Combine like terms: 16 + 9 = 25
9 + 6x2 + x4 = 25

Factor a perfect square on the left side:
(x2 + 3)(x2 + 3) = 25

Calculate the square root of the right side: 5

Break this problem into two subproblems by setting 
(x2 + 3) equal to 5 and -5.

Subproblem 1

x2 + 3 = 5 Simplifying x2 + 3 = 5 Reorder the terms: 3 + x2 = 5 Solving 3 + x2 = 5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x2 = 5 + -3 Combine like terms: 3 + -3 = 0 0 + x2 = 5 + -3 x2 = 5 + -3 Combine like terms: 5 + -3 = 2 x2 = 2 Simplifying x2 = 2 Take the square root of each side: x = {-1.414213562, 1.414213562}

Subproblem 2

x2 + 3 = -5 Simplifying x2 + 3 = -5 Reorder the terms: 3 + x2 = -5 Solving 3 + x2 = -5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x2 = -5 + -3 Combine like terms: 3 + -3 = 0 0 + x2 = -5 + -3 x2 = -5 + -3 Combine like terms: -5 + -3 = -8 x2 = -8 Simplifying x2 = -8 Reorder the terms: 8 + x2 = -8 + 8 Combine like terms: -8 + 8 = 0 8 + x2 = 0 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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