0=1.25x^4-6x^2+2

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Solution for 0=1.25x^4-6x^2+2 equation:


Simplifying
0 = 1.25x4 + -6x2 + 2

Reorder the terms:
0 = 2 + -6x2 + 1.25x4

Solving
0 = 2 + -6x2 + 1.25x4

Solving for variable 'x'.

Combine like terms: 0 + -2 = -2
-2 + 6x2 + -1.25x4 = 2 + -6x2 + 1.25x4 + -2 + 6x2 + -1.25x4

Reorder the terms:
-2 + 6x2 + -1.25x4 = 2 + -2 + -6x2 + 6x2 + 1.25x4 + -1.25x4

Combine like terms: 2 + -2 = 0
-2 + 6x2 + -1.25x4 = 0 + -6x2 + 6x2 + 1.25x4 + -1.25x4
-2 + 6x2 + -1.25x4 = -6x2 + 6x2 + 1.25x4 + -1.25x4

Combine like terms: -6x2 + 6x2 = 0
-2 + 6x2 + -1.25x4 = 0 + 1.25x4 + -1.25x4
-2 + 6x2 + -1.25x4 = 1.25x4 + -1.25x4

Combine like terms: 1.25x4 + -1.25x4 = 0.00
-2 + 6x2 + -1.25x4 = 0.00

Begin completing the square.  Divide all terms by
-1.25 the coefficient of the squared term: 

Divide each side by '-1.25'.
1.6 + -4.8x2 + x4 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + -4.8x2 + -1.6 + x4 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + -4.8x2 + x4 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -4.8x2 + x4 = 0 + -1.6
-4.8x2 + x4 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
-4.8x2 + x4 = -1.6

The x term is -4.8x2.  Take half its coefficient (-2.4).
Square it (5.76) and add it to both sides.

Add '5.76' to each side of the equation.
-4.8x2 + 5.76 + x4 = -1.6 + 5.76

Reorder the terms:
5.76 + -4.8x2 + x4 = -1.6 + 5.76

Combine like terms: -1.6 + 5.76 = 4.16
5.76 + -4.8x2 + x4 = 4.16

Factor a perfect square on the left side:
(x2 + -2.4)(x2 + -2.4) = 4.16

Calculate the square root of the right side: 2.039607805

Break this problem into two subproblems by setting 
(x2 + -2.4) equal to 2.039607805 and -2.039607805.

Subproblem 1

x2 + -2.4 = 2.039607805 Simplifying x2 + -2.4 = 2.039607805 Reorder the terms: -2.4 + x2 = 2.039607805 Solving -2.4 + x2 = 2.039607805 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.4' to each side of the equation. -2.4 + 2.4 + x2 = 2.039607805 + 2.4 Combine like terms: -2.4 + 2.4 = 0.0 0.0 + x2 = 2.039607805 + 2.4 x2 = 2.039607805 + 2.4 Combine like terms: 2.039607805 + 2.4 = 4.439607805 x2 = 4.439607805 Simplifying x2 = 4.439607805 Take the square root of each side: x = {-2.107037685, 2.107037685}

Subproblem 2

x2 + -2.4 = -2.039607805 Simplifying x2 + -2.4 = -2.039607805 Reorder the terms: -2.4 + x2 = -2.039607805 Solving -2.4 + x2 = -2.039607805 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.4' to each side of the equation. -2.4 + 2.4 + x2 = -2.039607805 + 2.4 Combine like terms: -2.4 + 2.4 = 0.0 0.0 + x2 = -2.039607805 + 2.4 x2 = -2.039607805 + 2.4 Combine like terms: -2.039607805 + 2.4 = 0.360392195 x2 = 0.360392195 Simplifying x2 = 0.360392195 Take the square root of each side: x = {-0.60032674, 0.60032674}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.107037685, 2.107037685, -0.60032674, 0.60032674}

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