2x^4-16x^2+5=0

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Solution for 2x^4-16x^2+5=0 equation:


Simplifying
2x4 + -16x2 + 5 = 0

Reorder the terms:
5 + -16x2 + 2x4 = 0

Solving
5 + -16x2 + 2x4 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
2.5 + -8x2 + x4 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -8x2 + -2.5 + x4 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -8x2 + x4 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -8x2 + x4 = 0 + -2.5
-8x2 + x4 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-8x2 + x4 = -2.5

The x term is -8x2.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x2 + 16 + x4 = -2.5 + 16

Reorder the terms:
16 + -8x2 + x4 = -2.5 + 16

Combine like terms: -2.5 + 16 = 13.5
16 + -8x2 + x4 = 13.5

Factor a perfect square on the left side:
(x2 + -4)(x2 + -4) = 13.5

Calculate the square root of the right side: 3.674234614

Break this problem into two subproblems by setting 
(x2 + -4) equal to 3.674234614 and -3.674234614.

Subproblem 1

x2 + -4 = 3.674234614 Simplifying x2 + -4 = 3.674234614 Reorder the terms: -4 + x2 = 3.674234614 Solving -4 + x2 = 3.674234614 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = 3.674234614 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 3.674234614 + 4 x2 = 3.674234614 + 4 Combine like terms: 3.674234614 + 4 = 7.674234614 x2 = 7.674234614 Simplifying x2 = 7.674234614 Take the square root of each side: x = {-2.770240895, 2.770240895}

Subproblem 2

x2 + -4 = -3.674234614 Simplifying x2 + -4 = -3.674234614 Reorder the terms: -4 + x2 = -3.674234614 Solving -4 + x2 = -3.674234614 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = -3.674234614 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -3.674234614 + 4 x2 = -3.674234614 + 4 Combine like terms: -3.674234614 + 4 = 0.325765386 x2 = 0.325765386 Simplifying x2 = 0.325765386 Take the square root of each side: x = {-0.570758606, 0.570758606}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.770240895, 2.770240895, -0.570758606, 0.570758606}

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