x^4-7x^2-14=0

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Solution for x^4-7x^2-14=0 equation:


Simplifying
x4 + -7x2 + -14 = 0

Reorder the terms:
-14 + -7x2 + x4 = 0

Solving
-14 + -7x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -7x2 + 14 + x4 = 0 + 14

Reorder the terms:
-14 + 14 + -7x2 + x4 = 0 + 14

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

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

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 = 14 + 12.25

Reorder the terms:
12.25 + -7x2 + x4 = 14 + 12.25

Combine like terms: 14 + 12.25 = 26.25
12.25 + -7x2 + x4 = 26.25

Factor a perfect square on the left side:
(x2 + -3.5)(x2 + -3.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(x2 + -3.5) equal to 5.123475383 and -5.123475383.

Subproblem 1

x2 + -3.5 = 5.123475383 Simplifying x2 + -3.5 = 5.123475383 Reorder the terms: -3.5 + x2 = 5.123475383 Solving -3.5 + x2 = 5.123475383 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 = 5.123475383 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x2 = 5.123475383 + 3.5 x2 = 5.123475383 + 3.5 Combine like terms: 5.123475383 + 3.5 = 8.623475383 x2 = 8.623475383 Simplifying x2 = 8.623475383 Take the square root of each side: x = {-2.936575452, 2.936575452}

Subproblem 2

x2 + -3.5 = -5.123475383 Simplifying x2 + -3.5 = -5.123475383 Reorder the terms: -3.5 + x2 = -5.123475383 Solving -3.5 + x2 = -5.123475383 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 = -5.123475383 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x2 = -5.123475383 + 3.5 x2 = -5.123475383 + 3.5 Combine like terms: -5.123475383 + 3.5 = -1.623475383 x2 = -1.623475383 Simplifying x2 = -1.623475383 Reorder the terms: 1.623475383 + x2 = -1.623475383 + 1.623475383 Combine like terms: -1.623475383 + 1.623475383 = 0.000000000 1.623475383 + 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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