x^4-7x^2-12=0

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Solution for x^4-7x^2-12=0 equation:


Simplifying
x4 + -7x2 + -12 = 0

Reorder the terms:
-12 + -7x2 + x4 = 0

Solving
-12 + -7x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -7x2 + 12 + x4 = 0 + 12

Reorder the terms:
-12 + 12 + -7x2 + x4 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -7x2 + x4 = 0 + 12
-7x2 + x4 = 0 + 12

Combine like terms: 0 + 12 = 12
-7x2 + x4 = 12

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 = 12 + 12.25

Reorder the terms:
12.25 + -7x2 + x4 = 12 + 12.25

Combine like terms: 12 + 12.25 = 24.25
12.25 + -7x2 + x4 = 24.25

Factor a perfect square on the left side:
(x2 + -3.5)(x2 + -3.5) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(x2 + -3.5) equal to 4.924428901 and -4.924428901.

Subproblem 1

x2 + -3.5 = 4.924428901 Simplifying x2 + -3.5 = 4.924428901 Reorder the terms: -3.5 + x2 = 4.924428901 Solving -3.5 + x2 = 4.924428901 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 = 4.924428901 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x2 = 4.924428901 + 3.5 x2 = 4.924428901 + 3.5 Combine like terms: 4.924428901 + 3.5 = 8.424428901 x2 = 8.424428901 Simplifying x2 = 8.424428901 Take the square root of each side: x = {-2.902486675, 2.902486675}

Subproblem 2

x2 + -3.5 = -4.924428901 Simplifying x2 + -3.5 = -4.924428901 Reorder the terms: -3.5 + x2 = -4.924428901 Solving -3.5 + x2 = -4.924428901 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 = -4.924428901 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x2 = -4.924428901 + 3.5 x2 = -4.924428901 + 3.5 Combine like terms: -4.924428901 + 3.5 = -1.424428901 x2 = -1.424428901 Simplifying x2 = -1.424428901 Reorder the terms: 1.424428901 + x2 = -1.424428901 + 1.424428901 Combine like terms: -1.424428901 + 1.424428901 = 0.000000000 1.424428901 + 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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