b^2+5b=88

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Solution for b^2+5b=88 equation:


Simplifying
b2 + 5b = 88

Reorder the terms:
5b + b2 = 88

Solving
5b + b2 = 88

Solving for variable 'b'.

Reorder the terms:
-88 + 5b + b2 = 88 + -88

Combine like terms: 88 + -88 = 0
-88 + 5b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '88' to each side of the equation.
-88 + 5b + 88 + b2 = 0 + 88

Reorder the terms:
-88 + 88 + 5b + b2 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + 5b + b2 = 0 + 88
5b + b2 = 0 + 88

Combine like terms: 0 + 88 = 88
5b + b2 = 88

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 = 88 + 6.25

Reorder the terms:
6.25 + 5b + b2 = 88 + 6.25

Combine like terms: 88 + 6.25 = 94.25
6.25 + 5b + b2 = 94.25

Factor a perfect square on the left side:
(b + 2.5)(b + 2.5) = 94.25

Calculate the square root of the right side: 9.708243919

Break this problem into two subproblems by setting 
(b + 2.5) equal to 9.708243919 and -9.708243919.

Subproblem 1

b + 2.5 = 9.708243919 Simplifying b + 2.5 = 9.708243919 Reorder the terms: 2.5 + b = 9.708243919 Solving 2.5 + b = 9.708243919 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 = 9.708243919 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + b = 9.708243919 + -2.5 b = 9.708243919 + -2.5 Combine like terms: 9.708243919 + -2.5 = 7.208243919 b = 7.208243919 Simplifying b = 7.208243919

Subproblem 2

b + 2.5 = -9.708243919 Simplifying b + 2.5 = -9.708243919 Reorder the terms: 2.5 + b = -9.708243919 Solving 2.5 + b = -9.708243919 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 = -9.708243919 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + b = -9.708243919 + -2.5 b = -9.708243919 + -2.5 Combine like terms: -9.708243919 + -2.5 = -12.208243919 b = -12.208243919 Simplifying b = -12.208243919

Solution

The solution to the problem is based on the solutions from the subproblems. b = {7.208243919, -12.208243919}

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