2b^2+3b-18=0

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Solution for 2b^2+3b-18=0 equation:


Simplifying
2b2 + 3b + -18 = 0

Reorder the terms:
-18 + 3b + 2b2 = 0

Solving
-18 + 3b + 2b2 = 0

Solving for variable 'b'.

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

Divide each side by '2'.
-9 + 1.5b + b2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 1.5b + 9 + b2 = 0 + 9

Reorder the terms:
-9 + 9 + 1.5b + b2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 1.5b + b2 = 0 + 9
1.5b + b2 = 0 + 9

Combine like terms: 0 + 9 = 9
1.5b + b2 = 9

The b term is 1.5b.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5b + 0.5625 + b2 = 9 + 0.5625

Reorder the terms:
0.5625 + 1.5b + b2 = 9 + 0.5625

Combine like terms: 9 + 0.5625 = 9.5625
0.5625 + 1.5b + b2 = 9.5625

Factor a perfect square on the left side:
(b + 0.75)(b + 0.75) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(b + 0.75) equal to 3.092329219 and -3.092329219.

Subproblem 1

b + 0.75 = 3.092329219 Simplifying b + 0.75 = 3.092329219 Reorder the terms: 0.75 + b = 3.092329219 Solving 0.75 + b = 3.092329219 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + b = 3.092329219 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + b = 3.092329219 + -0.75 b = 3.092329219 + -0.75 Combine like terms: 3.092329219 + -0.75 = 2.342329219 b = 2.342329219 Simplifying b = 2.342329219

Subproblem 2

b + 0.75 = -3.092329219 Simplifying b + 0.75 = -3.092329219 Reorder the terms: 0.75 + b = -3.092329219 Solving 0.75 + b = -3.092329219 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + b = -3.092329219 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + b = -3.092329219 + -0.75 b = -3.092329219 + -0.75 Combine like terms: -3.092329219 + -0.75 = -3.842329219 b = -3.842329219 Simplifying b = -3.842329219

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.342329219, -3.842329219}

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