2x^4=16x^2-23

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Solution for 2x^4=16x^2-23 equation:


Simplifying
2x4 = 16x2 + -23

Reorder the terms:
2x4 = -23 + 16x2

Solving
2x4 = -23 + 16x2

Solving for variable 'x'.

Reorder the terms:
23 + -16x2 + 2x4 = -23 + 16x2 + 23 + -16x2

Reorder the terms:
23 + -16x2 + 2x4 = -23 + 23 + 16x2 + -16x2

Combine like terms: -23 + 23 = 0
23 + -16x2 + 2x4 = 0 + 16x2 + -16x2
23 + -16x2 + 2x4 = 16x2 + -16x2

Combine like terms: 16x2 + -16x2 = 0
23 + -16x2 + 2x4 = 0

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

Divide each side by '2'.
11.5 + -8x2 + x4 = 0

Move the constant term to the right:

Add '-11.5' to each side of the equation.
11.5 + -8x2 + -11.5 + x4 = 0 + -11.5

Reorder the terms:
11.5 + -11.5 + -8x2 + x4 = 0 + -11.5

Combine like terms: 11.5 + -11.5 = 0.0
0.0 + -8x2 + x4 = 0 + -11.5
-8x2 + x4 = 0 + -11.5

Combine like terms: 0 + -11.5 = -11.5
-8x2 + x4 = -11.5

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 = -11.5 + 16

Reorder the terms:
16 + -8x2 + x4 = -11.5 + 16

Combine like terms: -11.5 + 16 = 4.5
16 + -8x2 + x4 = 4.5

Factor a perfect square on the left side:
(x2 + -4)(x2 + -4) = 4.5

Calculate the square root of the right side: 2.121320344

Break this problem into two subproblems by setting 
(x2 + -4) equal to 2.121320344 and -2.121320344.

Subproblem 1

x2 + -4 = 2.121320344 Simplifying x2 + -4 = 2.121320344 Reorder the terms: -4 + x2 = 2.121320344 Solving -4 + x2 = 2.121320344 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 = 2.121320344 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 2.121320344 + 4 x2 = 2.121320344 + 4 Combine like terms: 2.121320344 + 4 = 6.121320344 x2 = 6.121320344 Simplifying x2 = 6.121320344 Take the square root of each side: x = {-2.47413022, 2.47413022}

Subproblem 2

x2 + -4 = -2.121320344 Simplifying x2 + -4 = -2.121320344 Reorder the terms: -4 + x2 = -2.121320344 Solving -4 + x2 = -2.121320344 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 = -2.121320344 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -2.121320344 + 4 x2 = -2.121320344 + 4 Combine like terms: -2.121320344 + 4 = 1.878679656 x2 = 1.878679656 Simplifying x2 = 1.878679656 Take the square root of each side: x = {-1.370649356, 1.370649356}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.47413022, 2.47413022, -1.370649356, 1.370649356}

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