(2x^2)-(x^4)=0.5

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Solution for (2x^2)-(x^4)=0.5 equation:


Simplifying
(2x2) + -1(x4) = 0.5

Solving
(2x2) + -1x4 = 0.5

Solving for variable 'x'.

Reorder the terms:
-0.5 + (2x2) + -1x4 = 0.5 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
-0.5 + (2x2) + -1x4 = 0.0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
0.5 + (-2x2) + x4 = 0.0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + (-2x2) + -0.5 + x4 = 0.0 + -0.5

Reorder the terms:
0.5 + -0.5 + (-2x2) + x4 = 0.0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + (-2x2) + x4 = 0.0 + -0.5
(-2x2) + x4 = 0.0 + -0.5

Combine like terms: 0.0 + -0.5 = -0.5
(-2x2) + x4 = -0.5

The x term is (-2x2).  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
(-2x2) + 1 + x4 = -0.5 + 1

Reorder the terms:
1 + (-2x2) + x4 = -0.5 + 1

Combine like terms: -0.5 + 1 = 0.5
1 + (-2x2) + x4 = 0.5

Factor a perfect square on the left side:
(x2 + -1)(x2 + -1) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(x2 + -1) equal to 0.707106781 and -0.707106781.

Subproblem 1

x2 + -1 = 0.707106781 Simplifying x2 + -1 = 0.707106781 Reorder the terms: -1 + x2 = 0.707106781 Solving -1 + x2 = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x2 = 0.707106781 + 1 Combine like terms: -1 + 1 = 0 0 + x2 = 0.707106781 + 1 x2 = 0.707106781 + 1 Combine like terms: 0.707106781 + 1 = 1.707106781 x2 = 1.707106781 Simplifying x2 = 1.707106781 Take the square root of each side: x = {-1.306562965, 1.306562965}

Subproblem 2

x2 + -1 = -0.707106781 Simplifying x2 + -1 = -0.707106781 Reorder the terms: -1 + x2 = -0.707106781 Solving -1 + x2 = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x2 = -0.707106781 + 1 Combine like terms: -1 + 1 = 0 0 + x2 = -0.707106781 + 1 x2 = -0.707106781 + 1 Combine like terms: -0.707106781 + 1 = 0.292893219 x2 = 0.292893219 Simplifying x2 = 0.292893219 Take the square root of each side: x = {-0.5411961, 0.5411961}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.306562965, 1.306562965, -0.5411961, 0.5411961}

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