15b^2+18b-35=0

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Solution for 15b^2+18b-35=0 equation:


Simplifying
15b2 + 18b + -35 = 0

Reorder the terms:
-35 + 18b + 15b2 = 0

Solving
-35 + 18b + 15b2 = 0

Solving for variable 'b'.

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

Divide each side by '15'.
-2.333333333 + 1.2b + b2 = 0

Move the constant term to the right:

Add '2.333333333' to each side of the equation.
-2.333333333 + 1.2b + 2.333333333 + b2 = 0 + 2.333333333

Reorder the terms:
-2.333333333 + 2.333333333 + 1.2b + b2 = 0 + 2.333333333

Combine like terms: -2.333333333 + 2.333333333 = 0.000000000
0.000000000 + 1.2b + b2 = 0 + 2.333333333
1.2b + b2 = 0 + 2.333333333

Combine like terms: 0 + 2.333333333 = 2.333333333
1.2b + b2 = 2.333333333

The b term is 1.2b.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2b + 0.36 + b2 = 2.333333333 + 0.36

Reorder the terms:
0.36 + 1.2b + b2 = 2.333333333 + 0.36

Combine like terms: 2.333333333 + 0.36 = 2.693333333
0.36 + 1.2b + b2 = 2.693333333

Factor a perfect square on the left side:
(b + 0.6)(b + 0.6) = 2.693333333

Calculate the square root of the right side: 1.641137817

Break this problem into two subproblems by setting 
(b + 0.6) equal to 1.641137817 and -1.641137817.

Subproblem 1

b + 0.6 = 1.641137817 Simplifying b + 0.6 = 1.641137817 Reorder the terms: 0.6 + b = 1.641137817 Solving 0.6 + b = 1.641137817 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + b = 1.641137817 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + b = 1.641137817 + -0.6 b = 1.641137817 + -0.6 Combine like terms: 1.641137817 + -0.6 = 1.041137817 b = 1.041137817 Simplifying b = 1.041137817

Subproblem 2

b + 0.6 = -1.641137817 Simplifying b + 0.6 = -1.641137817 Reorder the terms: 0.6 + b = -1.641137817 Solving 0.6 + b = -1.641137817 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + b = -1.641137817 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + b = -1.641137817 + -0.6 b = -1.641137817 + -0.6 Combine like terms: -1.641137817 + -0.6 = -2.241137817 b = -2.241137817 Simplifying b = -2.241137817

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.041137817, -2.241137817}

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