17b^2-21=7b-b

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Solution for 17b^2-21=7b-b equation:


Simplifying
17b2 + -21 = 7b + -1b

Reorder the terms:
-21 + 17b2 = 7b + -1b

Combine like terms: 7b + -1b = 6b
-21 + 17b2 = 6b

Solving
-21 + 17b2 = 6b

Solving for variable 'b'.

Reorder the terms:
-21 + -6b + 17b2 = 6b + -6b

Combine like terms: 6b + -6b = 0
-21 + -6b + 17b2 = 0

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

Divide each side by '17'.
-1.235294118 + -0.3529411765b + b2 = 0

Move the constant term to the right:

Add '1.235294118' to each side of the equation.
-1.235294118 + -0.3529411765b + 1.235294118 + b2 = 0 + 1.235294118

Reorder the terms:
-1.235294118 + 1.235294118 + -0.3529411765b + b2 = 0 + 1.235294118

Combine like terms: -1.235294118 + 1.235294118 = 0.000000000
0.000000000 + -0.3529411765b + b2 = 0 + 1.235294118
-0.3529411765b + b2 = 0 + 1.235294118

Combine like terms: 0 + 1.235294118 = 1.235294118
-0.3529411765b + b2 = 1.235294118

The b term is -0.3529411765b.  Take half its coefficient (-0.1764705883).
Square it (0.03114186853) and add it to both sides.

Add '0.03114186853' to each side of the equation.
-0.3529411765b + 0.03114186853 + b2 = 1.235294118 + 0.03114186853

Reorder the terms:
0.03114186853 + -0.3529411765b + b2 = 1.235294118 + 0.03114186853

Combine like terms: 1.235294118 + 0.03114186853 = 1.26643598653
0.03114186853 + -0.3529411765b + b2 = 1.26643598653

Factor a perfect square on the left side:
(b + -0.1764705883)(b + -0.1764705883) = 1.26643598653

Calculate the square root of the right side: 1.125360381

Break this problem into two subproblems by setting 
(b + -0.1764705883) equal to 1.125360381 and -1.125360381.

Subproblem 1

b + -0.1764705883 = 1.125360381 Simplifying b + -0.1764705883 = 1.125360381 Reorder the terms: -0.1764705883 + b = 1.125360381 Solving -0.1764705883 + b = 1.125360381 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.1764705883' to each side of the equation. -0.1764705883 + 0.1764705883 + b = 1.125360381 + 0.1764705883 Combine like terms: -0.1764705883 + 0.1764705883 = 0.0000000000 0.0000000000 + b = 1.125360381 + 0.1764705883 b = 1.125360381 + 0.1764705883 Combine like terms: 1.125360381 + 0.1764705883 = 1.3018309693 b = 1.3018309693 Simplifying b = 1.3018309693

Subproblem 2

b + -0.1764705883 = -1.125360381 Simplifying b + -0.1764705883 = -1.125360381 Reorder the terms: -0.1764705883 + b = -1.125360381 Solving -0.1764705883 + b = -1.125360381 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.1764705883' to each side of the equation. -0.1764705883 + 0.1764705883 + b = -1.125360381 + 0.1764705883 Combine like terms: -0.1764705883 + 0.1764705883 = 0.0000000000 0.0000000000 + b = -1.125360381 + 0.1764705883 b = -1.125360381 + 0.1764705883 Combine like terms: -1.125360381 + 0.1764705883 = -0.9488897927 b = -0.9488897927 Simplifying b = -0.9488897927

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.3018309693, -0.9488897927}

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