(b+10)*b=5000

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Solution for (b+10)*b=5000 equation:


Simplifying
(b + 10) * b = 5000

Reorder the terms:
(10 + b) * b = 5000

Reorder the terms for easier multiplication:
b(10 + b) = 5000
(10 * b + b * b) = 5000
(10b + b2) = 5000

Solving
10b + b2 = 5000

Solving for variable 'b'.

Reorder the terms:
-5000 + 10b + b2 = 5000 + -5000

Combine like terms: 5000 + -5000 = 0
-5000 + 10b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5000' to each side of the equation.
-5000 + 10b + 5000 + b2 = 0 + 5000

Reorder the terms:
-5000 + 5000 + 10b + b2 = 0 + 5000

Combine like terms: -5000 + 5000 = 0
0 + 10b + b2 = 0 + 5000
10b + b2 = 0 + 5000

Combine like terms: 0 + 5000 = 5000
10b + b2 = 5000

The b term is 10b.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10b + 25 + b2 = 5000 + 25

Reorder the terms:
25 + 10b + b2 = 5000 + 25

Combine like terms: 5000 + 25 = 5025
25 + 10b + b2 = 5025

Factor a perfect square on the left side:
(b + 5)(b + 5) = 5025

Calculate the square root of the right side: 70.887234394

Break this problem into two subproblems by setting 
(b + 5) equal to 70.887234394 and -70.887234394.

Subproblem 1

b + 5 = 70.887234394 Simplifying b + 5 = 70.887234394 Reorder the terms: 5 + b = 70.887234394 Solving 5 + b = 70.887234394 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + b = 70.887234394 + -5 Combine like terms: 5 + -5 = 0 0 + b = 70.887234394 + -5 b = 70.887234394 + -5 Combine like terms: 70.887234394 + -5 = 65.887234394 b = 65.887234394 Simplifying b = 65.887234394

Subproblem 2

b + 5 = -70.887234394 Simplifying b + 5 = -70.887234394 Reorder the terms: 5 + b = -70.887234394 Solving 5 + b = -70.887234394 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + b = -70.887234394 + -5 Combine like terms: 5 + -5 = 0 0 + b = -70.887234394 + -5 b = -70.887234394 + -5 Combine like terms: -70.887234394 + -5 = -75.887234394 b = -75.887234394 Simplifying b = -75.887234394

Solution

The solution to the problem is based on the solutions from the subproblems. b = {65.887234394, -75.887234394}

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