1.3(8-b)3.7b=-5.2

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Solution for 1.3(8-b)3.7b=-5.2 equation:


Simplifying
1.3(8 + -1b) * 3.7b = -5.2

Reorder the terms for easier multiplication:
1.3 * 3.7b(8 + -1b) = -5.2

Multiply 1.3 * 3.7
4.81b(8 + -1b) = -5.2
(8 * 4.81b + -1b * 4.81b) = -5.2
(38.48b + -4.81b2) = -5.2

Solving
38.48b + -4.81b2 = -5.2

Solving for variable 'b'.

Reorder the terms:
5.2 + 38.48b + -4.81b2 = -5.2 + 5.2

Combine like terms: -5.2 + 5.2 = 0.0
5.2 + 38.48b + -4.81b2 = 0.0

Begin completing the square.  Divide all terms by
-4.81 the coefficient of the squared term: 

Divide each side by '-4.81'.
-1.081081081 + -8b + b2 = 0

Move the constant term to the right:

Add '1.081081081' to each side of the equation.
-1.081081081 + -8b + 1.081081081 + b2 = 0 + 1.081081081

Reorder the terms:
-1.081081081 + 1.081081081 + -8b + b2 = 0 + 1.081081081

Combine like terms: -1.081081081 + 1.081081081 = 0.000000000
0.000000000 + -8b + b2 = 0 + 1.081081081
-8b + b2 = 0 + 1.081081081

Combine like terms: 0 + 1.081081081 = 1.081081081
-8b + b2 = 1.081081081

The b term is -8b.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8b + 16 + b2 = 1.081081081 + 16

Reorder the terms:
16 + -8b + b2 = 1.081081081 + 16

Combine like terms: 1.081081081 + 16 = 17.081081081
16 + -8b + b2 = 17.081081081

Factor a perfect square on the left side:
(b + -4)(b + -4) = 17.081081081

Calculate the square root of the right side: 4.132926455

Break this problem into two subproblems by setting 
(b + -4) equal to 4.132926455 and -4.132926455.

Subproblem 1

b + -4 = 4.132926455 Simplifying b + -4 = 4.132926455 Reorder the terms: -4 + b = 4.132926455 Solving -4 + b = 4.132926455 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = 4.132926455 + 4 Combine like terms: -4 + 4 = 0 0 + b = 4.132926455 + 4 b = 4.132926455 + 4 Combine like terms: 4.132926455 + 4 = 8.132926455 b = 8.132926455 Simplifying b = 8.132926455

Subproblem 2

b + -4 = -4.132926455 Simplifying b + -4 = -4.132926455 Reorder the terms: -4 + b = -4.132926455 Solving -4 + b = -4.132926455 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = -4.132926455 + 4 Combine like terms: -4 + 4 = 0 0 + b = -4.132926455 + 4 b = -4.132926455 + 4 Combine like terms: -4.132926455 + 4 = -0.132926455 b = -0.132926455 Simplifying b = -0.132926455

Solution

The solution to the problem is based on the solutions from the subproblems. b = {8.132926455, -0.132926455}

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