b^2-12b+36=18

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Solution for b^2-12b+36=18 equation:


Simplifying
b2 + -12b + 36 = 18

Reorder the terms:
36 + -12b + b2 = 18

Solving
36 + -12b + b2 = 18

Solving for variable 'b'.

Reorder the terms:
36 + -18 + -12b + b2 = 18 + -18

Combine like terms: 36 + -18 = 18
18 + -12b + b2 = 18 + -18

Combine like terms: 18 + -18 = 0
18 + -12b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-18' to each side of the equation.
18 + -12b + -18 + b2 = 0 + -18

Reorder the terms:
18 + -18 + -12b + b2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -12b + b2 = 0 + -18
-12b + b2 = 0 + -18

Combine like terms: 0 + -18 = -18
-12b + b2 = -18

The b term is -12b.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12b + 36 + b2 = -18 + 36

Reorder the terms:
36 + -12b + b2 = -18 + 36

Combine like terms: -18 + 36 = 18
36 + -12b + b2 = 18

Factor a perfect square on the left side:
(b + -6)(b + -6) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(b + -6) equal to 4.242640687 and -4.242640687.

Subproblem 1

b + -6 = 4.242640687 Simplifying b + -6 = 4.242640687 Reorder the terms: -6 + b = 4.242640687 Solving -6 + b = 4.242640687 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + b = 4.242640687 + 6 Combine like terms: -6 + 6 = 0 0 + b = 4.242640687 + 6 b = 4.242640687 + 6 Combine like terms: 4.242640687 + 6 = 10.242640687 b = 10.242640687 Simplifying b = 10.242640687

Subproblem 2

b + -6 = -4.242640687 Simplifying b + -6 = -4.242640687 Reorder the terms: -6 + b = -4.242640687 Solving -6 + b = -4.242640687 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + b = -4.242640687 + 6 Combine like terms: -6 + 6 = 0 0 + b = -4.242640687 + 6 b = -4.242640687 + 6 Combine like terms: -4.242640687 + 6 = 1.757359313 b = 1.757359313 Simplifying b = 1.757359313

Solution

The solution to the problem is based on the solutions from the subproblems. b = {10.242640687, 1.757359313}

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