-7b+3(4b+8)b=4

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Solution for -7b+3(4b+8)b=4 equation:


Simplifying
-7b + 3(4b + 8) * b = 4

Reorder the terms:
-7b + 3(8 + 4b) * b = 4

Reorder the terms for easier multiplication:
-7b + 3b(8 + 4b) = 4
-7b + (8 * 3b + 4b * 3b) = 4
-7b + (24b + 12b2) = 4

Combine like terms: -7b + 24b = 17b
17b + 12b2 = 4

Solving
17b + 12b2 = 4

Solving for variable 'b'.

Reorder the terms:
-4 + 17b + 12b2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 17b + 12b2 = 0

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

Divide each side by '12'.
-0.3333333333 + 1.416666667b + b2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + 1.416666667b + 0.3333333333 + b2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + 1.416666667b + b2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + 1.416666667b + b2 = 0 + 0.3333333333
1.416666667b + b2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
1.416666667b + b2 = 0.3333333333

The b term is 1.416666667b.  Take half its coefficient (0.7083333335).
Square it (0.5017361113) and add it to both sides.

Add '0.5017361113' to each side of the equation.
1.416666667b + 0.5017361113 + b2 = 0.3333333333 + 0.5017361113

Reorder the terms:
0.5017361113 + 1.416666667b + b2 = 0.3333333333 + 0.5017361113

Combine like terms: 0.3333333333 + 0.5017361113 = 0.8350694446
0.5017361113 + 1.416666667b + b2 = 0.8350694446

Factor a perfect square on the left side:
(b + 0.7083333335)(b + 0.7083333335) = 0.8350694446

Calculate the square root of the right side: 0.913821342

Break this problem into two subproblems by setting 
(b + 0.7083333335) equal to 0.913821342 and -0.913821342.

Subproblem 1

b + 0.7083333335 = 0.913821342 Simplifying b + 0.7083333335 = 0.913821342 Reorder the terms: 0.7083333335 + b = 0.913821342 Solving 0.7083333335 + b = 0.913821342 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.7083333335' to each side of the equation. 0.7083333335 + -0.7083333335 + b = 0.913821342 + -0.7083333335 Combine like terms: 0.7083333335 + -0.7083333335 = 0.0000000000 0.0000000000 + b = 0.913821342 + -0.7083333335 b = 0.913821342 + -0.7083333335 Combine like terms: 0.913821342 + -0.7083333335 = 0.2054880085 b = 0.2054880085 Simplifying b = 0.2054880085

Subproblem 2

b + 0.7083333335 = -0.913821342 Simplifying b + 0.7083333335 = -0.913821342 Reorder the terms: 0.7083333335 + b = -0.913821342 Solving 0.7083333335 + b = -0.913821342 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.7083333335' to each side of the equation. 0.7083333335 + -0.7083333335 + b = -0.913821342 + -0.7083333335 Combine like terms: 0.7083333335 + -0.7083333335 = 0.0000000000 0.0000000000 + b = -0.913821342 + -0.7083333335 b = -0.913821342 + -0.7083333335 Combine like terms: -0.913821342 + -0.7083333335 = -1.6221546755 b = -1.6221546755 Simplifying b = -1.6221546755

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.2054880085, -1.6221546755}

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