4b^2+3b-9=0

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Solution for 4b^2+3b-9=0 equation:


Simplifying
4b2 + 3b + -9 = 0

Reorder the terms:
-9 + 3b + 4b2 = 0

Solving
-9 + 3b + 4b2 = 0

Solving for variable 'b'.

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

Divide each side by '4'.
-2.25 + 0.75b + b2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + 0.75b + 2.25 + b2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + 0.75b + b2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + 0.75b + b2 = 0 + 2.25
0.75b + b2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
0.75b + b2 = 2.25

The b term is 0.75b.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75b + 0.140625 + b2 = 2.25 + 0.140625

Reorder the terms:
0.140625 + 0.75b + b2 = 2.25 + 0.140625

Combine like terms: 2.25 + 0.140625 = 2.390625
0.140625 + 0.75b + b2 = 2.390625

Factor a perfect square on the left side:
(b + 0.375)(b + 0.375) = 2.390625

Calculate the square root of the right side: 1.54616461

Break this problem into two subproblems by setting 
(b + 0.375) equal to 1.54616461 and -1.54616461.

Subproblem 1

b + 0.375 = 1.54616461 Simplifying b + 0.375 = 1.54616461 Reorder the terms: 0.375 + b = 1.54616461 Solving 0.375 + b = 1.54616461 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + b = 1.54616461 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + b = 1.54616461 + -0.375 b = 1.54616461 + -0.375 Combine like terms: 1.54616461 + -0.375 = 1.17116461 b = 1.17116461 Simplifying b = 1.17116461

Subproblem 2

b + 0.375 = -1.54616461 Simplifying b + 0.375 = -1.54616461 Reorder the terms: 0.375 + b = -1.54616461 Solving 0.375 + b = -1.54616461 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + b = -1.54616461 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + b = -1.54616461 + -0.375 b = -1.54616461 + -0.375 Combine like terms: -1.54616461 + -0.375 = -1.92116461 b = -1.92116461 Simplifying b = -1.92116461

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.17116461, -1.92116461}

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