(4b)(4b)+13b-12=0

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Solution for (4b)(4b)+13b-12=0 equation:


Simplifying
(4b)(4b) + 13b + -12 = 0

Remove parenthesis around (4b)
4b(4b) + 13b + -12 = 0

Remove parenthesis around (4b)
4b * 4b + 13b + -12 = 0

Reorder the terms for easier multiplication:
4 * 4b * b + 13b + -12 = 0

Multiply 4 * 4
16b * b + 13b + -12 = 0

Multiply b * b
16b2 + 13b + -12 = 0

Reorder the terms:
-12 + 13b + 16b2 = 0

Solving
-12 + 13b + 16b2 = 0

Solving for variable 'b'.

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

Divide each side by '16'.
-0.75 + 0.8125b + b2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 0.8125b + 0.75 + b2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 0.8125b + b2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 0.8125b + b2 = 0 + 0.75
0.8125b + b2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
0.8125b + b2 = 0.75

The b term is 0.8125b.  Take half its coefficient (0.40625).
Square it (0.1650390625) and add it to both sides.

Add '0.1650390625' to each side of the equation.
0.8125b + 0.1650390625 + b2 = 0.75 + 0.1650390625

Reorder the terms:
0.1650390625 + 0.8125b + b2 = 0.75 + 0.1650390625

Combine like terms: 0.75 + 0.1650390625 = 0.9150390625
0.1650390625 + 0.8125b + b2 = 0.9150390625

Factor a perfect square on the left side:
(b + 0.40625)(b + 0.40625) = 0.9150390625

Calculate the square root of the right side: 0.956576742

Break this problem into two subproblems by setting 
(b + 0.40625) equal to 0.956576742 and -0.956576742.

Subproblem 1

b + 0.40625 = 0.956576742 Simplifying b + 0.40625 = 0.956576742 Reorder the terms: 0.40625 + b = 0.956576742 Solving 0.40625 + b = 0.956576742 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.40625' to each side of the equation. 0.40625 + -0.40625 + b = 0.956576742 + -0.40625 Combine like terms: 0.40625 + -0.40625 = 0.00000 0.00000 + b = 0.956576742 + -0.40625 b = 0.956576742 + -0.40625 Combine like terms: 0.956576742 + -0.40625 = 0.550326742 b = 0.550326742 Simplifying b = 0.550326742

Subproblem 2

b + 0.40625 = -0.956576742 Simplifying b + 0.40625 = -0.956576742 Reorder the terms: 0.40625 + b = -0.956576742 Solving 0.40625 + b = -0.956576742 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.40625' to each side of the equation. 0.40625 + -0.40625 + b = -0.956576742 + -0.40625 Combine like terms: 0.40625 + -0.40625 = 0.00000 0.00000 + b = -0.956576742 + -0.40625 b = -0.956576742 + -0.40625 Combine like terms: -0.956576742 + -0.40625 = -1.362826742 b = -1.362826742 Simplifying b = -1.362826742

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.550326742, -1.362826742}

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