10b^2+30b+-27=0

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Solution for 10b^2+30b+-27=0 equation:


Simplifying
10b2 + 30b + -27 = 0

Reorder the terms:
-27 + 30b + 10b2 = 0

Solving
-27 + 30b + 10b2 = 0

Solving for variable 'b'.

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

Divide each side by '10'.
-2.7 + 3b + b2 = 0

Move the constant term to the right:

Add '2.7' to each side of the equation.
-2.7 + 3b + 2.7 + b2 = 0 + 2.7

Reorder the terms:
-2.7 + 2.7 + 3b + b2 = 0 + 2.7

Combine like terms: -2.7 + 2.7 = 0.0
0.0 + 3b + b2 = 0 + 2.7
3b + b2 = 0 + 2.7

Combine like terms: 0 + 2.7 = 2.7
3b + b2 = 2.7

The b term is 3b.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3b + 2.25 + b2 = 2.7 + 2.25

Reorder the terms:
2.25 + 3b + b2 = 2.7 + 2.25

Combine like terms: 2.7 + 2.25 = 4.95
2.25 + 3b + b2 = 4.95

Factor a perfect square on the left side:
(b + 1.5)(b + 1.5) = 4.95

Calculate the square root of the right side: 2.224859546

Break this problem into two subproblems by setting 
(b + 1.5) equal to 2.224859546 and -2.224859546.

Subproblem 1

b + 1.5 = 2.224859546 Simplifying b + 1.5 = 2.224859546 Reorder the terms: 1.5 + b = 2.224859546 Solving 1.5 + b = 2.224859546 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + b = 2.224859546 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + b = 2.224859546 + -1.5 b = 2.224859546 + -1.5 Combine like terms: 2.224859546 + -1.5 = 0.724859546 b = 0.724859546 Simplifying b = 0.724859546

Subproblem 2

b + 1.5 = -2.224859546 Simplifying b + 1.5 = -2.224859546 Reorder the terms: 1.5 + b = -2.224859546 Solving 1.5 + b = -2.224859546 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + b = -2.224859546 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + b = -2.224859546 + -1.5 b = -2.224859546 + -1.5 Combine like terms: -2.224859546 + -1.5 = -3.724859546 b = -3.724859546 Simplifying b = -3.724859546

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.724859546, -3.724859546}

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