7x^4-5x^2-16=0

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Solution for 7x^4-5x^2-16=0 equation:


Simplifying
7x4 + -5x2 + -16 = 0

Reorder the terms:
-16 + -5x2 + 7x4 = 0

Solving
-16 + -5x2 + 7x4 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-2.285714286 + -0.7142857143x2 + x4 = 0

Move the constant term to the right:

Add '2.285714286' to each side of the equation.
-2.285714286 + -0.7142857143x2 + 2.285714286 + x4 = 0 + 2.285714286

Reorder the terms:
-2.285714286 + 2.285714286 + -0.7142857143x2 + x4 = 0 + 2.285714286

Combine like terms: -2.285714286 + 2.285714286 = 0.000000000
0.000000000 + -0.7142857143x2 + x4 = 0 + 2.285714286
-0.7142857143x2 + x4 = 0 + 2.285714286

Combine like terms: 0 + 2.285714286 = 2.285714286
-0.7142857143x2 + x4 = 2.285714286

The x term is -0.7142857143x2.  Take half its coefficient (-0.3571428572).
Square it (0.1275510204) and add it to both sides.

Add '0.1275510204' to each side of the equation.
-0.7142857143x2 + 0.1275510204 + x4 = 2.285714286 + 0.1275510204

Reorder the terms:
0.1275510204 + -0.7142857143x2 + x4 = 2.285714286 + 0.1275510204

Combine like terms: 2.285714286 + 0.1275510204 = 2.4132653064
0.1275510204 + -0.7142857143x2 + x4 = 2.4132653064

Factor a perfect square on the left side:
(x2 + -0.3571428572)(x2 + -0.3571428572) = 2.4132653064

Calculate the square root of the right side: 1.553468798

Break this problem into two subproblems by setting 
(x2 + -0.3571428572) equal to 1.553468798 and -1.553468798.

Subproblem 1

x2 + -0.3571428572 = 1.553468798 Simplifying x2 + -0.3571428572 = 1.553468798 Reorder the terms: -0.3571428572 + x2 = 1.553468798 Solving -0.3571428572 + x2 = 1.553468798 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3571428572' to each side of the equation. -0.3571428572 + 0.3571428572 + x2 = 1.553468798 + 0.3571428572 Combine like terms: -0.3571428572 + 0.3571428572 = 0.0000000000 0.0000000000 + x2 = 1.553468798 + 0.3571428572 x2 = 1.553468798 + 0.3571428572 Combine like terms: 1.553468798 + 0.3571428572 = 1.9106116552 x2 = 1.9106116552 Simplifying x2 = 1.9106116552 Take the square root of each side: x = {-1.382248767, 1.382248767}

Subproblem 2

x2 + -0.3571428572 = -1.553468798 Simplifying x2 + -0.3571428572 = -1.553468798 Reorder the terms: -0.3571428572 + x2 = -1.553468798 Solving -0.3571428572 + x2 = -1.553468798 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3571428572' to each side of the equation. -0.3571428572 + 0.3571428572 + x2 = -1.553468798 + 0.3571428572 Combine like terms: -0.3571428572 + 0.3571428572 = 0.0000000000 0.0000000000 + x2 = -1.553468798 + 0.3571428572 x2 = -1.553468798 + 0.3571428572 Combine like terms: -1.553468798 + 0.3571428572 = -1.1963259408 x2 = -1.1963259408 Simplifying x2 = -1.1963259408 Reorder the terms: 1.1963259408 + x2 = -1.1963259408 + 1.1963259408 Combine like terms: -1.1963259408 + 1.1963259408 = 0.0000000000 1.1963259408 + x2 = 0.0000000000 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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