b^2-10b-45=0

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Solution for b^2-10b-45=0 equation:


Simplifying
b2 + -10b + -45 = 0

Reorder the terms:
-45 + -10b + b2 = 0

Solving
-45 + -10b + b2 = 0

Solving for variable 'b'.

Begin completing the square.

Move the constant term to the right:

Add '45' to each side of the equation.
-45 + -10b + 45 + b2 = 0 + 45

Reorder the terms:
-45 + 45 + -10b + b2 = 0 + 45

Combine like terms: -45 + 45 = 0
0 + -10b + b2 = 0 + 45
-10b + b2 = 0 + 45

Combine like terms: 0 + 45 = 45
-10b + b2 = 45

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 = 45 + 25

Reorder the terms:
25 + -10b + b2 = 45 + 25

Combine like terms: 45 + 25 = 70
25 + -10b + b2 = 70

Factor a perfect square on the left side:
(b + -5)(b + -5) = 70

Calculate the square root of the right side: 8.366600265

Break this problem into two subproblems by setting 
(b + -5) equal to 8.366600265 and -8.366600265.

Subproblem 1

b + -5 = 8.366600265 Simplifying b + -5 = 8.366600265 Reorder the terms: -5 + b = 8.366600265 Solving -5 + b = 8.366600265 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 = 8.366600265 + 5 Combine like terms: -5 + 5 = 0 0 + b = 8.366600265 + 5 b = 8.366600265 + 5 Combine like terms: 8.366600265 + 5 = 13.366600265 b = 13.366600265 Simplifying b = 13.366600265

Subproblem 2

b + -5 = -8.366600265 Simplifying b + -5 = -8.366600265 Reorder the terms: -5 + b = -8.366600265 Solving -5 + b = -8.366600265 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 = -8.366600265 + 5 Combine like terms: -5 + 5 = 0 0 + b = -8.366600265 + 5 b = -8.366600265 + 5 Combine like terms: -8.366600265 + 5 = -3.366600265 b = -3.366600265 Simplifying b = -3.366600265

Solution

The solution to the problem is based on the solutions from the subproblems. b = {13.366600265, -3.366600265}

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