b^4-b^2-36=0

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Solution for b^4-b^2-36=0 equation:


Simplifying
b4 + -1b2 + -36 = 0

Reorder the terms:
-36 + -1b2 + b4 = 0

Solving
-36 + -1b2 + b4 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -1b2 + 36 + b4 = 0 + 36

Reorder the terms:
-36 + 36 + -1b2 + b4 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -1b2 + b4 = 0 + 36
-1b2 + b4 = 0 + 36

Combine like terms: 0 + 36 = 36
-1b2 + b4 = 36

The b term is -1b2.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1b2 + 0.25 + b4 = 36 + 0.25

Reorder the terms:
0.25 + -1b2 + b4 = 36 + 0.25

Combine like terms: 36 + 0.25 = 36.25
0.25 + -1b2 + b4 = 36.25

Factor a perfect square on the left side:
(b2 + -0.5)(b2 + -0.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(b2 + -0.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

b2 + -0.5 = 6.020797289 Simplifying b2 + -0.5 = 6.020797289 Reorder the terms: -0.5 + b2 = 6.020797289 Solving -0.5 + b2 = 6.020797289 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + b2 = 6.020797289 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + b2 = 6.020797289 + 0.5 b2 = 6.020797289 + 0.5 Combine like terms: 6.020797289 + 0.5 = 6.520797289 b2 = 6.520797289 Simplifying b2 = 6.520797289 Take the square root of each side: b = {-2.553585183, 2.553585183}

Subproblem 2

b2 + -0.5 = -6.020797289 Simplifying b2 + -0.5 = -6.020797289 Reorder the terms: -0.5 + b2 = -6.020797289 Solving -0.5 + b2 = -6.020797289 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + b2 = -6.020797289 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + b2 = -6.020797289 + 0.5 b2 = -6.020797289 + 0.5 Combine like terms: -6.020797289 + 0.5 = -5.520797289 b2 = -5.520797289 Simplifying b2 = -5.520797289 Reorder the terms: 5.520797289 + b2 = -5.520797289 + 5.520797289 Combine like terms: -5.520797289 + 5.520797289 = 0.000000000 5.520797289 + b2 = 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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