b^4-26b^2-256=0

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Solution for b^4-26b^2-256=0 equation:


Simplifying
b4 + -26b2 + -256 = 0

Reorder the terms:
-256 + -26b2 + b4 = 0

Solving
-256 + -26b2 + b4 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '256' to each side of the equation.
-256 + -26b2 + 256 + b4 = 0 + 256

Reorder the terms:
-256 + 256 + -26b2 + b4 = 0 + 256

Combine like terms: -256 + 256 = 0
0 + -26b2 + b4 = 0 + 256
-26b2 + b4 = 0 + 256

Combine like terms: 0 + 256 = 256
-26b2 + b4 = 256

The b term is -26b2.  Take half its coefficient (-13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
-26b2 + 169 + b4 = 256 + 169

Reorder the terms:
169 + -26b2 + b4 = 256 + 169

Combine like terms: 256 + 169 = 425
169 + -26b2 + b4 = 425

Factor a perfect square on the left side:
(b2 + -13)(b2 + -13) = 425

Calculate the square root of the right side: 20.615528128

Break this problem into two subproblems by setting 
(b2 + -13) equal to 20.615528128 and -20.615528128.

Subproblem 1

b2 + -13 = 20.615528128 Simplifying b2 + -13 = 20.615528128 Reorder the terms: -13 + b2 = 20.615528128 Solving -13 + b2 = 20.615528128 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + b2 = 20.615528128 + 13 Combine like terms: -13 + 13 = 0 0 + b2 = 20.615528128 + 13 b2 = 20.615528128 + 13 Combine like terms: 20.615528128 + 13 = 33.615528128 b2 = 33.615528128 Simplifying b2 = 33.615528128 Take the square root of each side: b = {-5.797889972, 5.797889972}

Subproblem 2

b2 + -13 = -20.615528128 Simplifying b2 + -13 = -20.615528128 Reorder the terms: -13 + b2 = -20.615528128 Solving -13 + b2 = -20.615528128 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + b2 = -20.615528128 + 13 Combine like terms: -13 + 13 = 0 0 + b2 = -20.615528128 + 13 b2 = -20.615528128 + 13 Combine like terms: -20.615528128 + 13 = -7.615528128 b2 = -7.615528128 Simplifying b2 = -7.615528128 Reorder the terms: 7.615528128 + b2 = -7.615528128 + 7.615528128 Combine like terms: -7.615528128 + 7.615528128 = 0.000000000 7.615528128 + 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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