(4b^2+6b)+(2b-15)=

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Solution for (4b^2+6b)+(2b-15)= equation:


Simplifying
(4b2 + 6b) + (2b + -15) = 0

Reorder the terms:
(6b + 4b2) + (2b + -15) = 0

Remove parenthesis around (6b + 4b2)
6b + 4b2 + (2b + -15) = 0

Reorder the terms:
6b + 4b2 + (-15 + 2b) = 0

Remove parenthesis around (-15 + 2b)
6b + 4b2 + -15 + 2b = 0

Reorder the terms:
-15 + 6b + 2b + 4b2 = 0

Combine like terms: 6b + 2b = 8b
-15 + 8b + 4b2 = 0

Solving
-15 + 8b + 4b2 = 0

Solving for variable 'b'.

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

Divide each side by '4'.
-3.75 + 2b + b2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + 2b + 3.75 + b2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + 2b + b2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + 2b + b2 = 0 + 3.75
2b + b2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
2b + b2 = 3.75

The b term is 2b.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2b + 1 + b2 = 3.75 + 1

Reorder the terms:
1 + 2b + b2 = 3.75 + 1

Combine like terms: 3.75 + 1 = 4.75
1 + 2b + b2 = 4.75

Factor a perfect square on the left side:
(b + 1)(b + 1) = 4.75

Calculate the square root of the right side: 2.179449472

Break this problem into two subproblems by setting 
(b + 1) equal to 2.179449472 and -2.179449472.

Subproblem 1

b + 1 = 2.179449472 Simplifying b + 1 = 2.179449472 Reorder the terms: 1 + b = 2.179449472 Solving 1 + b = 2.179449472 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + b = 2.179449472 + -1 Combine like terms: 1 + -1 = 0 0 + b = 2.179449472 + -1 b = 2.179449472 + -1 Combine like terms: 2.179449472 + -1 = 1.179449472 b = 1.179449472 Simplifying b = 1.179449472

Subproblem 2

b + 1 = -2.179449472 Simplifying b + 1 = -2.179449472 Reorder the terms: 1 + b = -2.179449472 Solving 1 + b = -2.179449472 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + b = -2.179449472 + -1 Combine like terms: 1 + -1 = 0 0 + b = -2.179449472 + -1 b = -2.179449472 + -1 Combine like terms: -2.179449472 + -1 = -3.179449472 b = -3.179449472 Simplifying b = -3.179449472

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.179449472, -3.179449472}

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