b^2-10b-64=7

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Solution for b^2-10b-64=7 equation:


Simplifying
b2 + -10b + -64 = 7

Reorder the terms:
-64 + -10b + b2 = 7

Solving
-64 + -10b + b2 = 7

Solving for variable 'b'.

Reorder the terms:
-64 + -7 + -10b + b2 = 7 + -7

Combine like terms: -64 + -7 = -71
-71 + -10b + b2 = 7 + -7

Combine like terms: 7 + -7 = 0
-71 + -10b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '71' to each side of the equation.
-71 + -10b + 71 + b2 = 0 + 71

Reorder the terms:
-71 + 71 + -10b + b2 = 0 + 71

Combine like terms: -71 + 71 = 0
0 + -10b + b2 = 0 + 71
-10b + b2 = 0 + 71

Combine like terms: 0 + 71 = 71
-10b + b2 = 71

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 = 71 + 25

Reorder the terms:
25 + -10b + b2 = 71 + 25

Combine like terms: 71 + 25 = 96
25 + -10b + b2 = 96

Factor a perfect square on the left side:
(b + -5)(b + -5) = 96

Calculate the square root of the right side: 9.797958971

Break this problem into two subproblems by setting 
(b + -5) equal to 9.797958971 and -9.797958971.

Subproblem 1

b + -5 = 9.797958971 Simplifying b + -5 = 9.797958971 Reorder the terms: -5 + b = 9.797958971 Solving -5 + b = 9.797958971 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 = 9.797958971 + 5 Combine like terms: -5 + 5 = 0 0 + b = 9.797958971 + 5 b = 9.797958971 + 5 Combine like terms: 9.797958971 + 5 = 14.797958971 b = 14.797958971 Simplifying b = 14.797958971

Subproblem 2

b + -5 = -9.797958971 Simplifying b + -5 = -9.797958971 Reorder the terms: -5 + b = -9.797958971 Solving -5 + b = -9.797958971 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 = -9.797958971 + 5 Combine like terms: -5 + 5 = 0 0 + b = -9.797958971 + 5 b = -9.797958971 + 5 Combine like terms: -9.797958971 + 5 = -4.797958971 b = -4.797958971 Simplifying b = -4.797958971

Solution

The solution to the problem is based on the solutions from the subproblems. b = {14.797958971, -4.797958971}

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