5x^4+18x^2+7=0

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Solution for 5x^4+18x^2+7=0 equation:


Simplifying
5x4 + 18x2 + 7 = 0

Reorder the terms:
7 + 18x2 + 5x4 = 0

Solving
7 + 18x2 + 5x4 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
1.4 + 3.6x2 + x4 = 0

Move the constant term to the right:

Add '-1.4' to each side of the equation.
1.4 + 3.6x2 + -1.4 + x4 = 0 + -1.4

Reorder the terms:
1.4 + -1.4 + 3.6x2 + x4 = 0 + -1.4

Combine like terms: 1.4 + -1.4 = 0.0
0.0 + 3.6x2 + x4 = 0 + -1.4
3.6x2 + x4 = 0 + -1.4

Combine like terms: 0 + -1.4 = -1.4
3.6x2 + x4 = -1.4

The x term is 3.6x2.  Take half its coefficient (1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
3.6x2 + 3.24 + x4 = -1.4 + 3.24

Reorder the terms:
3.24 + 3.6x2 + x4 = -1.4 + 3.24

Combine like terms: -1.4 + 3.24 = 1.84
3.24 + 3.6x2 + x4 = 1.84

Factor a perfect square on the left side:
(x2 + 1.8)(x2 + 1.8) = 1.84

Calculate the square root of the right side: 1.356465997

Break this problem into two subproblems by setting 
(x2 + 1.8) equal to 1.356465997 and -1.356465997.

Subproblem 1

x2 + 1.8 = 1.356465997 Simplifying x2 + 1.8 = 1.356465997 Reorder the terms: 1.8 + x2 = 1.356465997 Solving 1.8 + x2 = 1.356465997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.8' to each side of the equation. 1.8 + -1.8 + x2 = 1.356465997 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + x2 = 1.356465997 + -1.8 x2 = 1.356465997 + -1.8 Combine like terms: 1.356465997 + -1.8 = -0.443534003 x2 = -0.443534003 Simplifying x2 = -0.443534003 Reorder the terms: 0.443534003 + x2 = -0.443534003 + 0.443534003 Combine like terms: -0.443534003 + 0.443534003 = 0.000000000 0.443534003 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined.

Subproblem 2

x2 + 1.8 = -1.356465997 Simplifying x2 + 1.8 = -1.356465997 Reorder the terms: 1.8 + x2 = -1.356465997 Solving 1.8 + x2 = -1.356465997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.8' to each side of the equation. 1.8 + -1.8 + x2 = -1.356465997 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + x2 = -1.356465997 + -1.8 x2 = -1.356465997 + -1.8 Combine like terms: -1.356465997 + -1.8 = -3.156465997 x2 = -3.156465997 Simplifying x2 = -3.156465997 Reorder the terms: 3.156465997 + x2 = -3.156465997 + 3.156465997 Combine like terms: -3.156465997 + 3.156465997 = 0.000000000 3.156465997 + x2 = 0.000000000 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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