7(b-2)b=8

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Solution for 7(b-2)b=8 equation:


Simplifying
7(b + -2) * b = 8

Reorder the terms:
7(-2 + b) * b = 8

Reorder the terms for easier multiplication:
7b(-2 + b) = 8
(-2 * 7b + b * 7b) = 8
(-14b + 7b2) = 8

Solving
-14b + 7b2 = 8

Solving for variable 'b'.

Reorder the terms:
-8 + -14b + 7b2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + -14b + 7b2 = 0

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

Divide each side by '7'.
-1.142857143 + -2b + b2 = 0

Move the constant term to the right:

Add '1.142857143' to each side of the equation.
-1.142857143 + -2b + 1.142857143 + b2 = 0 + 1.142857143

Reorder the terms:
-1.142857143 + 1.142857143 + -2b + b2 = 0 + 1.142857143

Combine like terms: -1.142857143 + 1.142857143 = 0.000000000
0.000000000 + -2b + b2 = 0 + 1.142857143
-2b + b2 = 0 + 1.142857143

Combine like terms: 0 + 1.142857143 = 1.142857143
-2b + b2 = 1.142857143

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 = 1.142857143 + 1

Reorder the terms:
1 + -2b + b2 = 1.142857143 + 1

Combine like terms: 1.142857143 + 1 = 2.142857143
1 + -2b + b2 = 2.142857143

Factor a perfect square on the left side:
(b + -1)(b + -1) = 2.142857143

Calculate the square root of the right side: 1.463850109

Break this problem into two subproblems by setting 
(b + -1) equal to 1.463850109 and -1.463850109.

Subproblem 1

b + -1 = 1.463850109 Simplifying b + -1 = 1.463850109 Reorder the terms: -1 + b = 1.463850109 Solving -1 + b = 1.463850109 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 = 1.463850109 + 1 Combine like terms: -1 + 1 = 0 0 + b = 1.463850109 + 1 b = 1.463850109 + 1 Combine like terms: 1.463850109 + 1 = 2.463850109 b = 2.463850109 Simplifying b = 2.463850109

Subproblem 2

b + -1 = -1.463850109 Simplifying b + -1 = -1.463850109 Reorder the terms: -1 + b = -1.463850109 Solving -1 + b = -1.463850109 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 = -1.463850109 + 1 Combine like terms: -1 + 1 = 0 0 + b = -1.463850109 + 1 b = -1.463850109 + 1 Combine like terms: -1.463850109 + 1 = -0.463850109 b = -0.463850109 Simplifying b = -0.463850109

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.463850109, -0.463850109}

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