20b^2-17b=32

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Solution for 20b^2-17b=32 equation:


Simplifying
20b2 + -17b = 32

Reorder the terms:
-17b + 20b2 = 32

Solving
-17b + 20b2 = 32

Solving for variable 'b'.

Reorder the terms:
-32 + -17b + 20b2 = 32 + -32

Combine like terms: 32 + -32 = 0
-32 + -17b + 20b2 = 0

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

Divide each side by '20'.
-1.6 + -0.85b + b2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -0.85b + 1.6 + b2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -0.85b + b2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -0.85b + b2 = 0 + 1.6
-0.85b + b2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-0.85b + b2 = 1.6

The b term is -0.85b.  Take half its coefficient (-0.425).
Square it (0.180625) and add it to both sides.

Add '0.180625' to each side of the equation.
-0.85b + 0.180625 + b2 = 1.6 + 0.180625

Reorder the terms:
0.180625 + -0.85b + b2 = 1.6 + 0.180625

Combine like terms: 1.6 + 0.180625 = 1.780625
0.180625 + -0.85b + b2 = 1.780625

Factor a perfect square on the left side:
(b + -0.425)(b + -0.425) = 1.780625

Calculate the square root of the right side: 1.334400615

Break this problem into two subproblems by setting 
(b + -0.425) equal to 1.334400615 and -1.334400615.

Subproblem 1

b + -0.425 = 1.334400615 Simplifying b + -0.425 = 1.334400615 Reorder the terms: -0.425 + b = 1.334400615 Solving -0.425 + b = 1.334400615 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.425' to each side of the equation. -0.425 + 0.425 + b = 1.334400615 + 0.425 Combine like terms: -0.425 + 0.425 = 0.000 0.000 + b = 1.334400615 + 0.425 b = 1.334400615 + 0.425 Combine like terms: 1.334400615 + 0.425 = 1.759400615 b = 1.759400615 Simplifying b = 1.759400615

Subproblem 2

b + -0.425 = -1.334400615 Simplifying b + -0.425 = -1.334400615 Reorder the terms: -0.425 + b = -1.334400615 Solving -0.425 + b = -1.334400615 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.425' to each side of the equation. -0.425 + 0.425 + b = -1.334400615 + 0.425 Combine like terms: -0.425 + 0.425 = 0.000 0.000 + b = -1.334400615 + 0.425 b = -1.334400615 + 0.425 Combine like terms: -1.334400615 + 0.425 = -0.909400615 b = -0.909400615 Simplifying b = -0.909400615

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.759400615, -0.909400615}

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