b^2+10b+25=8

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Solution for b^2+10b+25=8 equation:


Simplifying
b2 + 10b + 25 = 8

Reorder the terms:
25 + 10b + b2 = 8

Solving
25 + 10b + b2 = 8

Solving for variable 'b'.

Reorder the terms:
25 + -8 + 10b + b2 = 8 + -8

Combine like terms: 25 + -8 = 17
17 + 10b + b2 = 8 + -8

Combine like terms: 8 + -8 = 0
17 + 10b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-17' to each side of the equation.
17 + 10b + -17 + b2 = 0 + -17

Reorder the terms:
17 + -17 + 10b + b2 = 0 + -17

Combine like terms: 17 + -17 = 0
0 + 10b + b2 = 0 + -17
10b + b2 = 0 + -17

Combine like terms: 0 + -17 = -17
10b + b2 = -17

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 = -17 + 25

Reorder the terms:
25 + 10b + b2 = -17 + 25

Combine like terms: -17 + 25 = 8
25 + 10b + b2 = 8

Factor a perfect square on the left side:
(b + 5)(b + 5) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(b + 5) equal to 2.828427125 and -2.828427125.

Subproblem 1

b + 5 = 2.828427125 Simplifying b + 5 = 2.828427125 Reorder the terms: 5 + b = 2.828427125 Solving 5 + b = 2.828427125 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 = 2.828427125 + -5 Combine like terms: 5 + -5 = 0 0 + b = 2.828427125 + -5 b = 2.828427125 + -5 Combine like terms: 2.828427125 + -5 = -2.171572875 b = -2.171572875 Simplifying b = -2.171572875

Subproblem 2

b + 5 = -2.828427125 Simplifying b + 5 = -2.828427125 Reorder the terms: 5 + b = -2.828427125 Solving 5 + b = -2.828427125 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 = -2.828427125 + -5 Combine like terms: 5 + -5 = 0 0 + b = -2.828427125 + -5 b = -2.828427125 + -5 Combine like terms: -2.828427125 + -5 = -7.828427125 b = -7.828427125 Simplifying b = -7.828427125

Solution

The solution to the problem is based on the solutions from the subproblems. b = {-2.171572875, -7.828427125}

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