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

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


Simplifying
-1b(b + -3) + -1(4b + -7) = 3b + 4

Reorder the terms:
-1b(-3 + b) + -1(4b + -7) = 3b + 4
(-3 * -1b + b * -1b) + -1(4b + -7) = 3b + 4
(3b + -1b2) + -1(4b + -7) = 3b + 4

Reorder the terms:
3b + -1b2 + -1(-7 + 4b) = 3b + 4
3b + -1b2 + (-7 * -1 + 4b * -1) = 3b + 4
3b + -1b2 + (7 + -4b) = 3b + 4

Reorder the terms:
7 + 3b + -4b + -1b2 = 3b + 4

Combine like terms: 3b + -4b = -1b
7 + -1b + -1b2 = 3b + 4

Reorder the terms:
7 + -1b + -1b2 = 4 + 3b

Solving
7 + -1b + -1b2 = 4 + 3b

Solving for variable 'b'.

Reorder the terms:
7 + -4 + -1b + -3b + -1b2 = 4 + 3b + -4 + -3b

Combine like terms: 7 + -4 = 3
3 + -1b + -3b + -1b2 = 4 + 3b + -4 + -3b

Combine like terms: -1b + -3b = -4b
3 + -4b + -1b2 = 4 + 3b + -4 + -3b

Reorder the terms:
3 + -4b + -1b2 = 4 + -4 + 3b + -3b

Combine like terms: 4 + -4 = 0
3 + -4b + -1b2 = 0 + 3b + -3b
3 + -4b + -1b2 = 3b + -3b

Combine like terms: 3b + -3b = 0
3 + -4b + -1b2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-3 + 4b + b2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 4b + 3 + b2 = 0 + 3

Reorder the terms:
-3 + 3 + 4b + b2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 4b + b2 = 0 + 3
4b + b2 = 0 + 3

Combine like terms: 0 + 3 = 3
4b + b2 = 3

The b term is 4b.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4b + 4 + b2 = 3 + 4

Reorder the terms:
4 + 4b + b2 = 3 + 4

Combine like terms: 3 + 4 = 7
4 + 4b + b2 = 7

Factor a perfect square on the left side:
(b + 2)(b + 2) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(b + 2) equal to 2.645751311 and -2.645751311.

Subproblem 1

b + 2 = 2.645751311 Simplifying b + 2 = 2.645751311 Reorder the terms: 2 + b = 2.645751311 Solving 2 + b = 2.645751311 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + b = 2.645751311 + -2 Combine like terms: 2 + -2 = 0 0 + b = 2.645751311 + -2 b = 2.645751311 + -2 Combine like terms: 2.645751311 + -2 = 0.645751311 b = 0.645751311 Simplifying b = 0.645751311

Subproblem 2

b + 2 = -2.645751311 Simplifying b + 2 = -2.645751311 Reorder the terms: 2 + b = -2.645751311 Solving 2 + b = -2.645751311 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + b = -2.645751311 + -2 Combine like terms: 2 + -2 = 0 0 + b = -2.645751311 + -2 b = -2.645751311 + -2 Combine like terms: -2.645751311 + -2 = -4.645751311 b = -4.645751311 Simplifying b = -4.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.645751311, -4.645751311}

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