-b^2+8b=10

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


Simplifying
-1b2 + 8b = 10

Reorder the terms:
8b + -1b2 = 10

Solving
8b + -1b2 = 10

Solving for variable 'b'.

Reorder the terms:
-10 + 8b + -1b2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + 8b + -1b2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
10 + -8b + b2 = 0

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + -8b + -10 + b2 = 0 + -10

Reorder the terms:
10 + -10 + -8b + b2 = 0 + -10

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

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

The b term is -8b.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8b + 16 + b2 = -10 + 16

Reorder the terms:
16 + -8b + b2 = -10 + 16

Combine like terms: -10 + 16 = 6
16 + -8b + b2 = 6

Factor a perfect square on the left side:
(b + -4)(b + -4) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(b + -4) equal to 2.449489743 and -2.449489743.

Subproblem 1

b + -4 = 2.449489743 Simplifying b + -4 = 2.449489743 Reorder the terms: -4 + b = 2.449489743 Solving -4 + b = 2.449489743 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = 2.449489743 + 4 Combine like terms: -4 + 4 = 0 0 + b = 2.449489743 + 4 b = 2.449489743 + 4 Combine like terms: 2.449489743 + 4 = 6.449489743 b = 6.449489743 Simplifying b = 6.449489743

Subproblem 2

b + -4 = -2.449489743 Simplifying b + -4 = -2.449489743 Reorder the terms: -4 + b = -2.449489743 Solving -4 + b = -2.449489743 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + b = -2.449489743 + 4 Combine like terms: -4 + 4 = 0 0 + b = -2.449489743 + 4 b = -2.449489743 + 4 Combine like terms: -2.449489743 + 4 = 1.550510257 b = 1.550510257 Simplifying b = 1.550510257

Solution

The solution to the problem is based on the solutions from the subproblems. b = {6.449489743, 1.550510257}

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