x^4+7x^2+8=14

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Solution for x^4+7x^2+8=14 equation:


Simplifying
x4 + 7x2 + 8 = 14

Reorder the terms:
8 + 7x2 + x4 = 14

Solving
8 + 7x2 + x4 = 14

Solving for variable 'x'.

Reorder the terms:
8 + -14 + 7x2 + x4 = 14 + -14

Combine like terms: 8 + -14 = -6
-6 + 7x2 + x4 = 14 + -14

Combine like terms: 14 + -14 = 0
-6 + 7x2 + x4 = 0

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 7x2 + 6 + x4 = 0 + 6

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

Combine like terms: -6 + 6 = 0
0 + 7x2 + x4 = 0 + 6
7x2 + x4 = 0 + 6

Combine like terms: 0 + 6 = 6
7x2 + x4 = 6

The x term is 7x2.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x2 + 12.25 + x4 = 6 + 12.25

Reorder the terms:
12.25 + 7x2 + x4 = 6 + 12.25

Combine like terms: 6 + 12.25 = 18.25
12.25 + 7x2 + x4 = 18.25

Factor a perfect square on the left side:
(x2 + 3.5)(x2 + 3.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(x2 + 3.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

x2 + 3.5 = 4.272001873 Simplifying x2 + 3.5 = 4.272001873 Reorder the terms: 3.5 + x2 = 4.272001873 Solving 3.5 + x2 = 4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x2 = 4.272001873 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x2 = 4.272001873 + -3.5 x2 = 4.272001873 + -3.5 Combine like terms: 4.272001873 + -3.5 = 0.772001873 x2 = 0.772001873 Simplifying x2 = 0.772001873 Take the square root of each side: x = {-0.878636371, 0.878636371}

Subproblem 2

x2 + 3.5 = -4.272001873 Simplifying x2 + 3.5 = -4.272001873 Reorder the terms: 3.5 + x2 = -4.272001873 Solving 3.5 + x2 = -4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x2 = -4.272001873 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x2 = -4.272001873 + -3.5 x2 = -4.272001873 + -3.5 Combine like terms: -4.272001873 + -3.5 = -7.772001873 x2 = -7.772001873 Simplifying x2 = -7.772001873 Reorder the terms: 7.772001873 + x2 = -7.772001873 + 7.772001873 Combine like terms: -7.772001873 + 7.772001873 = 0.000000000 7.772001873 + 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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