5b^2-16b=32

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Solution for 5b^2-16b=32 equation:


Simplifying
5b2 + -16b = 32

Reorder the terms:
-16b + 5b2 = 32

Solving
-16b + 5b2 = 32

Solving for variable 'b'.

Reorder the terms:
-32 + -16b + 5b2 = 32 + -32

Combine like terms: 32 + -32 = 0
-32 + -16b + 5b2 = 0

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

Divide each side by '5'.
-6.4 + -3.2b + b2 = 0

Move the constant term to the right:

Add '6.4' to each side of the equation.
-6.4 + -3.2b + 6.4 + b2 = 0 + 6.4

Reorder the terms:
-6.4 + 6.4 + -3.2b + b2 = 0 + 6.4

Combine like terms: -6.4 + 6.4 = 0.0
0.0 + -3.2b + b2 = 0 + 6.4
-3.2b + b2 = 0 + 6.4

Combine like terms: 0 + 6.4 = 6.4
-3.2b + b2 = 6.4

The b term is -3.2b.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2b + 2.56 + b2 = 6.4 + 2.56

Reorder the terms:
2.56 + -3.2b + b2 = 6.4 + 2.56

Combine like terms: 6.4 + 2.56 = 8.96
2.56 + -3.2b + b2 = 8.96

Factor a perfect square on the left side:
(b + -1.6)(b + -1.6) = 8.96

Calculate the square root of the right side: 2.993325909

Break this problem into two subproblems by setting 
(b + -1.6) equal to 2.993325909 and -2.993325909.

Subproblem 1

b + -1.6 = 2.993325909 Simplifying b + -1.6 = 2.993325909 Reorder the terms: -1.6 + b = 2.993325909 Solving -1.6 + b = 2.993325909 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + b = 2.993325909 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + b = 2.993325909 + 1.6 b = 2.993325909 + 1.6 Combine like terms: 2.993325909 + 1.6 = 4.593325909 b = 4.593325909 Simplifying b = 4.593325909

Subproblem 2

b + -1.6 = -2.993325909 Simplifying b + -1.6 = -2.993325909 Reorder the terms: -1.6 + b = -2.993325909 Solving -1.6 + b = -2.993325909 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + b = -2.993325909 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + b = -2.993325909 + 1.6 b = -2.993325909 + 1.6 Combine like terms: -2.993325909 + 1.6 = -1.393325909 b = -1.393325909 Simplifying b = -1.393325909

Solution

The solution to the problem is based on the solutions from the subproblems. b = {4.593325909, -1.393325909}

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