0=b^2+5b-26

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Solution for 0=b^2+5b-26 equation:


Simplifying
0 = b2 + 5b + -26

Reorder the terms:
0 = -26 + 5b + b2

Solving
0 = -26 + 5b + b2

Solving for variable 'b'.

Combine like terms: 0 + 26 = 26
26 + -5b + -1b2 = -26 + 5b + b2 + 26 + -5b + -1b2

Reorder the terms:
26 + -5b + -1b2 = -26 + 26 + 5b + -5b + b2 + -1b2

Combine like terms: -26 + 26 = 0
26 + -5b + -1b2 = 0 + 5b + -5b + b2 + -1b2
26 + -5b + -1b2 = 5b + -5b + b2 + -1b2

Combine like terms: 5b + -5b = 0
26 + -5b + -1b2 = 0 + b2 + -1b2
26 + -5b + -1b2 = b2 + -1b2

Combine like terms: b2 + -1b2 = 0
26 + -5b + -1b2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-26 + 5b + b2 = 0

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + 5b + 26 + b2 = 0 + 26

Reorder the terms:
-26 + 26 + 5b + b2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + 5b + b2 = 0 + 26
5b + b2 = 0 + 26

Combine like terms: 0 + 26 = 26
5b + b2 = 26

The b term is 5b.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5b + 6.25 + b2 = 26 + 6.25

Reorder the terms:
6.25 + 5b + b2 = 26 + 6.25

Combine like terms: 26 + 6.25 = 32.25
6.25 + 5b + b2 = 32.25

Factor a perfect square on the left side:
(b + 2.5)(b + 2.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(b + 2.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

b + 2.5 = 5.678908346 Simplifying b + 2.5 = 5.678908346 Reorder the terms: 2.5 + b = 5.678908346 Solving 2.5 + b = 5.678908346 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + b = 5.678908346 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + b = 5.678908346 + -2.5 b = 5.678908346 + -2.5 Combine like terms: 5.678908346 + -2.5 = 3.178908346 b = 3.178908346 Simplifying b = 3.178908346

Subproblem 2

b + 2.5 = -5.678908346 Simplifying b + 2.5 = -5.678908346 Reorder the terms: 2.5 + b = -5.678908346 Solving 2.5 + b = -5.678908346 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + b = -5.678908346 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + b = -5.678908346 + -2.5 b = -5.678908346 + -2.5 Combine like terms: -5.678908346 + -2.5 = -8.178908346 b = -8.178908346 Simplifying b = -8.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.178908346, -8.178908346}

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