7x^4+6x^2-27=0

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Solution for 7x^4+6x^2-27=0 equation:


Simplifying
7x4 + 6x2 + -27 = 0

Reorder the terms:
-27 + 6x2 + 7x4 = 0

Solving
-27 + 6x2 + 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'.
-3.857142857 + 0.8571428571x2 + x4 = 0

Move the constant term to the right:

Add '3.857142857' to each side of the equation.
-3.857142857 + 0.8571428571x2 + 3.857142857 + x4 = 0 + 3.857142857

Reorder the terms:
-3.857142857 + 3.857142857 + 0.8571428571x2 + x4 = 0 + 3.857142857

Combine like terms: -3.857142857 + 3.857142857 = 0.000000000
0.000000000 + 0.8571428571x2 + x4 = 0 + 3.857142857
0.8571428571x2 + x4 = 0 + 3.857142857

Combine like terms: 0 + 3.857142857 = 3.857142857
0.8571428571x2 + x4 = 3.857142857

The x term is 0.8571428571x2.  Take half its coefficient (0.4285714286).
Square it (0.1836734694) and add it to both sides.

Add '0.1836734694' to each side of the equation.
0.8571428571x2 + 0.1836734694 + x4 = 3.857142857 + 0.1836734694

Reorder the terms:
0.1836734694 + 0.8571428571x2 + x4 = 3.857142857 + 0.1836734694

Combine like terms: 3.857142857 + 0.1836734694 = 4.0408163264
0.1836734694 + 0.8571428571x2 + x4 = 4.0408163264

Factor a perfect square on the left side:
(x2 + 0.4285714286)(x2 + 0.4285714286) = 4.0408163264

Calculate the square root of the right side: 2.010178183

Break this problem into two subproblems by setting 
(x2 + 0.4285714286) equal to 2.010178183 and -2.010178183.

Subproblem 1

x2 + 0.4285714286 = 2.010178183 Simplifying x2 + 0.4285714286 = 2.010178183 Reorder the terms: 0.4285714286 + x2 = 2.010178183 Solving 0.4285714286 + x2 = 2.010178183 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4285714286' to each side of the equation. 0.4285714286 + -0.4285714286 + x2 = 2.010178183 + -0.4285714286 Combine like terms: 0.4285714286 + -0.4285714286 = 0.0000000000 0.0000000000 + x2 = 2.010178183 + -0.4285714286 x2 = 2.010178183 + -0.4285714286 Combine like terms: 2.010178183 + -0.4285714286 = 1.5816067544 x2 = 1.5816067544 Simplifying x2 = 1.5816067544 Take the square root of each side: x = {-1.257619479, 1.257619479}

Subproblem 2

x2 + 0.4285714286 = -2.010178183 Simplifying x2 + 0.4285714286 = -2.010178183 Reorder the terms: 0.4285714286 + x2 = -2.010178183 Solving 0.4285714286 + x2 = -2.010178183 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4285714286' to each side of the equation. 0.4285714286 + -0.4285714286 + x2 = -2.010178183 + -0.4285714286 Combine like terms: 0.4285714286 + -0.4285714286 = 0.0000000000 0.0000000000 + x2 = -2.010178183 + -0.4285714286 x2 = -2.010178183 + -0.4285714286 Combine like terms: -2.010178183 + -0.4285714286 = -2.4387496116 x2 = -2.4387496116 Simplifying x2 = -2.4387496116 Reorder the terms: 2.4387496116 + x2 = -2.4387496116 + 2.4387496116 Combine like terms: -2.4387496116 + 2.4387496116 = 0.0000000000 2.4387496116 + 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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