b^2+2b+1=7b-2

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Solution for b^2+2b+1=7b-2 equation:


Simplifying
b2 + 2b + 1 = 7b + -2

Reorder the terms:
1 + 2b + b2 = 7b + -2

Reorder the terms:
1 + 2b + b2 = -2 + 7b

Solving
1 + 2b + b2 = -2 + 7b

Solving for variable 'b'.

Reorder the terms:
1 + 2 + 2b + -7b + b2 = -2 + 7b + 2 + -7b

Combine like terms: 1 + 2 = 3
3 + 2b + -7b + b2 = -2 + 7b + 2 + -7b

Combine like terms: 2b + -7b = -5b
3 + -5b + b2 = -2 + 7b + 2 + -7b

Reorder the terms:
3 + -5b + b2 = -2 + 2 + 7b + -7b

Combine like terms: -2 + 2 = 0
3 + -5b + b2 = 0 + 7b + -7b
3 + -5b + b2 = 7b + -7b

Combine like terms: 7b + -7b = 0
3 + -5b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -5b + -3 + b2 = 0 + -3

Reorder the terms:
3 + -3 + -5b + b2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -5b + b2 = 0 + -3
-5b + b2 = 0 + -3

Combine like terms: 0 + -3 = -3
-5b + b2 = -3

The b term is -5b.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5b + 6.25 + b2 = -3 + 6.25

Reorder the terms:
6.25 + -5b + b2 = -3 + 6.25

Combine like terms: -3 + 6.25 = 3.25
6.25 + -5b + b2 = 3.25

Factor a perfect square on the left side:
(b + -2.5)(b + -2.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(b + -2.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

b + -2.5 = 1.802775638 Simplifying b + -2.5 = 1.802775638 Reorder the terms: -2.5 + b = 1.802775638 Solving -2.5 + b = 1.802775638 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + b = 1.802775638 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + b = 1.802775638 + 2.5 b = 1.802775638 + 2.5 Combine like terms: 1.802775638 + 2.5 = 4.302775638 b = 4.302775638 Simplifying b = 4.302775638

Subproblem 2

b + -2.5 = -1.802775638 Simplifying b + -2.5 = -1.802775638 Reorder the terms: -2.5 + b = -1.802775638 Solving -2.5 + b = -1.802775638 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + b = -1.802775638 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + b = -1.802775638 + 2.5 b = -1.802775638 + 2.5 Combine like terms: -1.802775638 + 2.5 = 0.697224362 b = 0.697224362 Simplifying b = 0.697224362

Solution

The solution to the problem is based on the solutions from the subproblems. b = {4.302775638, 0.697224362}

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