b^2+5-28=3b+7

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Solution for b^2+5-28=3b+7 equation:


Simplifying
b2 + 5 + -28 = 3b + 7

Reorder the terms:
5 + -28 + b2 = 3b + 7

Combine like terms: 5 + -28 = -23
-23 + b2 = 3b + 7

Reorder the terms:
-23 + b2 = 7 + 3b

Solving
-23 + b2 = 7 + 3b

Solving for variable 'b'.

Reorder the terms:
-23 + -7 + -3b + b2 = 7 + 3b + -7 + -3b

Combine like terms: -23 + -7 = -30
-30 + -3b + b2 = 7 + 3b + -7 + -3b

Reorder the terms:
-30 + -3b + b2 = 7 + -7 + 3b + -3b

Combine like terms: 7 + -7 = 0
-30 + -3b + b2 = 0 + 3b + -3b
-30 + -3b + b2 = 3b + -3b

Combine like terms: 3b + -3b = 0
-30 + -3b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -3b + 30 + b2 = 0 + 30

Reorder the terms:
-30 + 30 + -3b + b2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -3b + b2 = 0 + 30
-3b + b2 = 0 + 30

Combine like terms: 0 + 30 = 30
-3b + b2 = 30

The b term is -3b.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3b + 2.25 + b2 = 30 + 2.25

Reorder the terms:
2.25 + -3b + b2 = 30 + 2.25

Combine like terms: 30 + 2.25 = 32.25
2.25 + -3b + b2 = 32.25

Factor a perfect square on the left side:
(b + -1.5)(b + -1.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(b + -1.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

b + -1.5 = 5.678908346 Simplifying b + -1.5 = 5.678908346 Reorder the terms: -1.5 + b = 5.678908346 Solving -1.5 + b = 5.678908346 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + b = 5.678908346 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + b = 5.678908346 + 1.5 b = 5.678908346 + 1.5 Combine like terms: 5.678908346 + 1.5 = 7.178908346 b = 7.178908346 Simplifying b = 7.178908346

Subproblem 2

b + -1.5 = -5.678908346 Simplifying b + -1.5 = -5.678908346 Reorder the terms: -1.5 + b = -5.678908346 Solving -1.5 + b = -5.678908346 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + b = -5.678908346 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + b = -5.678908346 + 1.5 b = -5.678908346 + 1.5 Combine like terms: -5.678908346 + 1.5 = -4.178908346 b = -4.178908346 Simplifying b = -4.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. b = {7.178908346, -4.178908346}

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