b^2+16b+64=7

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Solution for b^2+16b+64=7 equation:


Simplifying
b2 + 16b + 64 = 7

Reorder the terms:
64 + 16b + b2 = 7

Solving
64 + 16b + b2 = 7

Solving for variable 'b'.

Reorder the terms:
64 + -7 + 16b + b2 = 7 + -7

Combine like terms: 64 + -7 = 57
57 + 16b + b2 = 7 + -7

Combine like terms: 7 + -7 = 0
57 + 16b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-57' to each side of the equation.
57 + 16b + -57 + b2 = 0 + -57

Reorder the terms:
57 + -57 + 16b + b2 = 0 + -57

Combine like terms: 57 + -57 = 0
0 + 16b + b2 = 0 + -57
16b + b2 = 0 + -57

Combine like terms: 0 + -57 = -57
16b + b2 = -57

The b term is 16b.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16b + 64 + b2 = -57 + 64

Reorder the terms:
64 + 16b + b2 = -57 + 64

Combine like terms: -57 + 64 = 7
64 + 16b + b2 = 7

Factor a perfect square on the left side:
(b + 8)(b + 8) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(b + 8) equal to 2.645751311 and -2.645751311.

Subproblem 1

b + 8 = 2.645751311 Simplifying b + 8 = 2.645751311 Reorder the terms: 8 + b = 2.645751311 Solving 8 + b = 2.645751311 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + b = 2.645751311 + -8 Combine like terms: 8 + -8 = 0 0 + b = 2.645751311 + -8 b = 2.645751311 + -8 Combine like terms: 2.645751311 + -8 = -5.354248689 b = -5.354248689 Simplifying b = -5.354248689

Subproblem 2

b + 8 = -2.645751311 Simplifying b + 8 = -2.645751311 Reorder the terms: 8 + b = -2.645751311 Solving 8 + b = -2.645751311 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + b = -2.645751311 + -8 Combine like terms: 8 + -8 = 0 0 + b = -2.645751311 + -8 b = -2.645751311 + -8 Combine like terms: -2.645751311 + -8 = -10.645751311 b = -10.645751311 Simplifying b = -10.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. b = {-5.354248689, -10.645751311}

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