56=0.5b^2+6b

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Solution for 56=0.5b^2+6b equation:


Simplifying
56 = 0.5b2 + 6b

Reorder the terms:
56 = 6b + 0.5b2

Solving
56 = 6b + 0.5b2

Solving for variable 'b'.

Reorder the terms:
56 + -6b + -0.5b2 = 6b + -6b + 0.5b2 + -0.5b2

Combine like terms: 6b + -6b = 0
56 + -6b + -0.5b2 = 0 + 0.5b2 + -0.5b2
56 + -6b + -0.5b2 = 0.5b2 + -0.5b2

Combine like terms: 0.5b2 + -0.5b2 = 0.0
56 + -6b + -0.5b2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-112 + 12b + b2 = 0

Move the constant term to the right:

Add '112' to each side of the equation.
-112 + 12b + 112 + b2 = 0 + 112

Reorder the terms:
-112 + 112 + 12b + b2 = 0 + 112

Combine like terms: -112 + 112 = 0
0 + 12b + b2 = 0 + 112
12b + b2 = 0 + 112

Combine like terms: 0 + 112 = 112
12b + b2 = 112

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 = 112 + 36

Reorder the terms:
36 + 12b + b2 = 112 + 36

Combine like terms: 112 + 36 = 148
36 + 12b + b2 = 148

Factor a perfect square on the left side:
(b + 6)(b + 6) = 148

Calculate the square root of the right side: 12.165525061

Break this problem into two subproblems by setting 
(b + 6) equal to 12.165525061 and -12.165525061.

Subproblem 1

b + 6 = 12.165525061 Simplifying b + 6 = 12.165525061 Reorder the terms: 6 + b = 12.165525061 Solving 6 + b = 12.165525061 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 = 12.165525061 + -6 Combine like terms: 6 + -6 = 0 0 + b = 12.165525061 + -6 b = 12.165525061 + -6 Combine like terms: 12.165525061 + -6 = 6.165525061 b = 6.165525061 Simplifying b = 6.165525061

Subproblem 2

b + 6 = -12.165525061 Simplifying b + 6 = -12.165525061 Reorder the terms: 6 + b = -12.165525061 Solving 6 + b = -12.165525061 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 = -12.165525061 + -6 Combine like terms: 6 + -6 = 0 0 + b = -12.165525061 + -6 b = -12.165525061 + -6 Combine like terms: -12.165525061 + -6 = -18.165525061 b = -18.165525061 Simplifying b = -18.165525061

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.165525061, -18.165525061}

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