10b^2-27b=18

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Solution for 10b^2-27b=18 equation:


Simplifying
10b2 + -27b = 18

Reorder the terms:
-27b + 10b2 = 18

Solving
-27b + 10b2 = 18

Solving for variable 'b'.

Reorder the terms:
-18 + -27b + 10b2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + -27b + 10b2 = 0

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

Divide each side by '10'.
-1.8 + -2.7b + b2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + -2.7b + 1.8 + b2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + -2.7b + b2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + -2.7b + b2 = 0 + 1.8
-2.7b + b2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
-2.7b + b2 = 1.8

The b term is -2.7b.  Take half its coefficient (-1.35).
Square it (1.8225) and add it to both sides.

Add '1.8225' to each side of the equation.
-2.7b + 1.8225 + b2 = 1.8 + 1.8225

Reorder the terms:
1.8225 + -2.7b + b2 = 1.8 + 1.8225

Combine like terms: 1.8 + 1.8225 = 3.6225
1.8225 + -2.7b + b2 = 3.6225

Factor a perfect square on the left side:
(b + -1.35)(b + -1.35) = 3.6225

Calculate the square root of the right side: 1.903286631

Break this problem into two subproblems by setting 
(b + -1.35) equal to 1.903286631 and -1.903286631.

Subproblem 1

b + -1.35 = 1.903286631 Simplifying b + -1.35 = 1.903286631 Reorder the terms: -1.35 + b = 1.903286631 Solving -1.35 + b = 1.903286631 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.35' to each side of the equation. -1.35 + 1.35 + b = 1.903286631 + 1.35 Combine like terms: -1.35 + 1.35 = 0.00 0.00 + b = 1.903286631 + 1.35 b = 1.903286631 + 1.35 Combine like terms: 1.903286631 + 1.35 = 3.253286631 b = 3.253286631 Simplifying b = 3.253286631

Subproblem 2

b + -1.35 = -1.903286631 Simplifying b + -1.35 = -1.903286631 Reorder the terms: -1.35 + b = -1.903286631 Solving -1.35 + b = -1.903286631 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.35' to each side of the equation. -1.35 + 1.35 + b = -1.903286631 + 1.35 Combine like terms: -1.35 + 1.35 = 0.00 0.00 + b = -1.903286631 + 1.35 b = -1.903286631 + 1.35 Combine like terms: -1.903286631 + 1.35 = -0.553286631 b = -0.553286631 Simplifying b = -0.553286631

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.253286631, -0.553286631}

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