b^2-2b-54=7

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Solution for b^2-2b-54=7 equation:


Simplifying
b2 + -2b + -54 = 7

Reorder the terms:
-54 + -2b + b2 = 7

Solving
-54 + -2b + b2 = 7

Solving for variable 'b'.

Reorder the terms:
-54 + -7 + -2b + b2 = 7 + -7

Combine like terms: -54 + -7 = -61
-61 + -2b + b2 = 7 + -7

Combine like terms: 7 + -7 = 0
-61 + -2b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '61' to each side of the equation.
-61 + -2b + 61 + b2 = 0 + 61

Reorder the terms:
-61 + 61 + -2b + b2 = 0 + 61

Combine like terms: -61 + 61 = 0
0 + -2b + b2 = 0 + 61
-2b + b2 = 0 + 61

Combine like terms: 0 + 61 = 61
-2b + b2 = 61

The b term is -2b.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2b + 1 + b2 = 61 + 1

Reorder the terms:
1 + -2b + b2 = 61 + 1

Combine like terms: 61 + 1 = 62
1 + -2b + b2 = 62

Factor a perfect square on the left side:
(b + -1)(b + -1) = 62

Calculate the square root of the right side: 7.874007874

Break this problem into two subproblems by setting 
(b + -1) equal to 7.874007874 and -7.874007874.

Subproblem 1

b + -1 = 7.874007874 Simplifying b + -1 = 7.874007874 Reorder the terms: -1 + b = 7.874007874 Solving -1 + b = 7.874007874 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = 7.874007874 + 1 Combine like terms: -1 + 1 = 0 0 + b = 7.874007874 + 1 b = 7.874007874 + 1 Combine like terms: 7.874007874 + 1 = 8.874007874 b = 8.874007874 Simplifying b = 8.874007874

Subproblem 2

b + -1 = -7.874007874 Simplifying b + -1 = -7.874007874 Reorder the terms: -1 + b = -7.874007874 Solving -1 + b = -7.874007874 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = -7.874007874 + 1 Combine like terms: -1 + 1 = 0 0 + b = -7.874007874 + 1 b = -7.874007874 + 1 Combine like terms: -7.874007874 + 1 = -6.874007874 b = -6.874007874 Simplifying b = -6.874007874

Solution

The solution to the problem is based on the solutions from the subproblems. b = {8.874007874, -6.874007874}

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