b^2-13b+27=0

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Solution for b^2-13b+27=0 equation:


Simplifying
b2 + -13b + 27 = 0

Reorder the terms:
27 + -13b + b2 = 0

Solving
27 + -13b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '-27' to each side of the equation.
27 + -13b + -27 + b2 = 0 + -27

Reorder the terms:
27 + -27 + -13b + b2 = 0 + -27

Combine like terms: 27 + -27 = 0
0 + -13b + b2 = 0 + -27
-13b + b2 = 0 + -27

Combine like terms: 0 + -27 = -27
-13b + b2 = -27

The b term is -13b.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13b + 42.25 + b2 = -27 + 42.25

Reorder the terms:
42.25 + -13b + b2 = -27 + 42.25

Combine like terms: -27 + 42.25 = 15.25
42.25 + -13b + b2 = 15.25

Factor a perfect square on the left side:
(b + -6.5)(b + -6.5) = 15.25

Calculate the square root of the right side: 3.905124838

Break this problem into two subproblems by setting 
(b + -6.5) equal to 3.905124838 and -3.905124838.

Subproblem 1

b + -6.5 = 3.905124838 Simplifying b + -6.5 = 3.905124838 Reorder the terms: -6.5 + b = 3.905124838 Solving -6.5 + b = 3.905124838 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + b = 3.905124838 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + b = 3.905124838 + 6.5 b = 3.905124838 + 6.5 Combine like terms: 3.905124838 + 6.5 = 10.405124838 b = 10.405124838 Simplifying b = 10.405124838

Subproblem 2

b + -6.5 = -3.905124838 Simplifying b + -6.5 = -3.905124838 Reorder the terms: -6.5 + b = -3.905124838 Solving -6.5 + b = -3.905124838 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + b = -3.905124838 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + b = -3.905124838 + 6.5 b = -3.905124838 + 6.5 Combine like terms: -3.905124838 + 6.5 = 2.594875162 b = 2.594875162 Simplifying b = 2.594875162

Solution

The solution to the problem is based on the solutions from the subproblems. b = {10.405124838, 2.594875162}

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