18b^2+5b-4=0

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Solution for 18b^2+5b-4=0 equation:


Simplifying
18b2 + 5b + -4 = 0

Reorder the terms:
-4 + 5b + 18b2 = 0

Solving
-4 + 5b + 18b2 = 0

Solving for variable 'b'.

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

Divide each side by '18'.
-0.2222222222 + 0.2777777778b + b2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + 0.2777777778b + 0.2222222222 + b2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + 0.2777777778b + b2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + 0.2777777778b + b2 = 0 + 0.2222222222
0.2777777778b + b2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
0.2777777778b + b2 = 0.2222222222

The b term is 0.2777777778b.  Take half its coefficient (0.1388888889).
Square it (0.01929012346) and add it to both sides.

Add '0.01929012346' to each side of the equation.
0.2777777778b + 0.01929012346 + b2 = 0.2222222222 + 0.01929012346

Reorder the terms:
0.01929012346 + 0.2777777778b + b2 = 0.2222222222 + 0.01929012346

Combine like terms: 0.2222222222 + 0.01929012346 = 0.24151234566
0.01929012346 + 0.2777777778b + b2 = 0.24151234566

Factor a perfect square on the left side:
(b + 0.1388888889)(b + 0.1388888889) = 0.24151234566

Calculate the square root of the right side: 0.491439056

Break this problem into two subproblems by setting 
(b + 0.1388888889) equal to 0.491439056 and -0.491439056.

Subproblem 1

b + 0.1388888889 = 0.491439056 Simplifying b + 0.1388888889 = 0.491439056 Reorder the terms: 0.1388888889 + b = 0.491439056 Solving 0.1388888889 + b = 0.491439056 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.1388888889' to each side of the equation. 0.1388888889 + -0.1388888889 + b = 0.491439056 + -0.1388888889 Combine like terms: 0.1388888889 + -0.1388888889 = 0.0000000000 0.0000000000 + b = 0.491439056 + -0.1388888889 b = 0.491439056 + -0.1388888889 Combine like terms: 0.491439056 + -0.1388888889 = 0.3525501671 b = 0.3525501671 Simplifying b = 0.3525501671

Subproblem 2

b + 0.1388888889 = -0.491439056 Simplifying b + 0.1388888889 = -0.491439056 Reorder the terms: 0.1388888889 + b = -0.491439056 Solving 0.1388888889 + b = -0.491439056 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.1388888889' to each side of the equation. 0.1388888889 + -0.1388888889 + b = -0.491439056 + -0.1388888889 Combine like terms: 0.1388888889 + -0.1388888889 = 0.0000000000 0.0000000000 + b = -0.491439056 + -0.1388888889 b = -0.491439056 + -0.1388888889 Combine like terms: -0.491439056 + -0.1388888889 = -0.6303279449 b = -0.6303279449 Simplifying b = -0.6303279449

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.3525501671, -0.6303279449}

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