9b^2+5b-9=0

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Solution for 9b^2+5b-9=0 equation:


Simplifying
9b2 + 5b + -9 = 0

Reorder the terms:
-9 + 5b + 9b2 = 0

Solving
-9 + 5b + 9b2 = 0

Solving for variable 'b'.

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

Divide each side by '9'.
-1 + 0.5555555556b + b2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 0.5555555556b + 1 + b2 = 0 + 1

Reorder the terms:
-1 + 1 + 0.5555555556b + b2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.5555555556b + b2 = 0 + 1
0.5555555556b + b2 = 0 + 1

Combine like terms: 0 + 1 = 1
0.5555555556b + b2 = 1

The b term is 0.5555555556b.  Take half its coefficient (0.2777777778).
Square it (0.07716049384) and add it to both sides.

Add '0.07716049384' to each side of the equation.
0.5555555556b + 0.07716049384 + b2 = 1 + 0.07716049384

Reorder the terms:
0.07716049384 + 0.5555555556b + b2 = 1 + 0.07716049384

Combine like terms: 1 + 0.07716049384 = 1.07716049384
0.07716049384 + 0.5555555556b + b2 = 1.07716049384

Factor a perfect square on the left side:
(b + 0.2777777778)(b + 0.2777777778) = 1.07716049384

Calculate the square root of the right side: 1.037863427

Break this problem into two subproblems by setting 
(b + 0.2777777778) equal to 1.037863427 and -1.037863427.

Subproblem 1

b + 0.2777777778 = 1.037863427 Simplifying b + 0.2777777778 = 1.037863427 Reorder the terms: 0.2777777778 + b = 1.037863427 Solving 0.2777777778 + b = 1.037863427 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.2777777778' to each side of the equation. 0.2777777778 + -0.2777777778 + b = 1.037863427 + -0.2777777778 Combine like terms: 0.2777777778 + -0.2777777778 = 0.0000000000 0.0000000000 + b = 1.037863427 + -0.2777777778 b = 1.037863427 + -0.2777777778 Combine like terms: 1.037863427 + -0.2777777778 = 0.7600856492 b = 0.7600856492 Simplifying b = 0.7600856492

Subproblem 2

b + 0.2777777778 = -1.037863427 Simplifying b + 0.2777777778 = -1.037863427 Reorder the terms: 0.2777777778 + b = -1.037863427 Solving 0.2777777778 + b = -1.037863427 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.2777777778' to each side of the equation. 0.2777777778 + -0.2777777778 + b = -1.037863427 + -0.2777777778 Combine like terms: 0.2777777778 + -0.2777777778 = 0.0000000000 0.0000000000 + b = -1.037863427 + -0.2777777778 b = -1.037863427 + -0.2777777778 Combine like terms: -1.037863427 + -0.2777777778 = -1.3156412048 b = -1.3156412048 Simplifying b = -1.3156412048

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.7600856492, -1.3156412048}

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