b^2+10b-79=0

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Solution for b^2+10b-79=0 equation:


Simplifying
b2 + 10b + -79 = 0

Reorder the terms:
-79 + 10b + b2 = 0

Solving
-79 + 10b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '79' to each side of the equation.
-79 + 10b + 79 + b2 = 0 + 79

Reorder the terms:
-79 + 79 + 10b + b2 = 0 + 79

Combine like terms: -79 + 79 = 0
0 + 10b + b2 = 0 + 79
10b + b2 = 0 + 79

Combine like terms: 0 + 79 = 79
10b + b2 = 79

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 = 79 + 25

Reorder the terms:
25 + 10b + b2 = 79 + 25

Combine like terms: 79 + 25 = 104
25 + 10b + b2 = 104

Factor a perfect square on the left side:
(b + 5)(b + 5) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(b + 5) equal to 10.198039027 and -10.198039027.

Subproblem 1

b + 5 = 10.198039027 Simplifying b + 5 = 10.198039027 Reorder the terms: 5 + b = 10.198039027 Solving 5 + b = 10.198039027 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 = 10.198039027 + -5 Combine like terms: 5 + -5 = 0 0 + b = 10.198039027 + -5 b = 10.198039027 + -5 Combine like terms: 10.198039027 + -5 = 5.198039027 b = 5.198039027 Simplifying b = 5.198039027

Subproblem 2

b + 5 = -10.198039027 Simplifying b + 5 = -10.198039027 Reorder the terms: 5 + b = -10.198039027 Solving 5 + b = -10.198039027 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 = -10.198039027 + -5 Combine like terms: 5 + -5 = 0 0 + b = -10.198039027 + -5 b = -10.198039027 + -5 Combine like terms: -10.198039027 + -5 = -15.198039027 b = -15.198039027 Simplifying b = -15.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. b = {5.198039027, -15.198039027}

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