6b^2+9b-7=0

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Solution for 6b^2+9b-7=0 equation:


Simplifying
6b2 + 9b + -7 = 0

Reorder the terms:
-7 + 9b + 6b2 = 0

Solving
-7 + 9b + 6b2 = 0

Solving for variable 'b'.

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

Divide each side by '6'.
-1.166666667 + 1.5b + b2 = 0

Move the constant term to the right:

Add '1.166666667' to each side of the equation.
-1.166666667 + 1.5b + 1.166666667 + b2 = 0 + 1.166666667

Reorder the terms:
-1.166666667 + 1.166666667 + 1.5b + b2 = 0 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + 1.5b + b2 = 0 + 1.166666667
1.5b + b2 = 0 + 1.166666667

Combine like terms: 0 + 1.166666667 = 1.166666667
1.5b + b2 = 1.166666667

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 = 1.166666667 + 0.5625

Reorder the terms:
0.5625 + 1.5b + b2 = 1.166666667 + 0.5625

Combine like terms: 1.166666667 + 0.5625 = 1.729166667
0.5625 + 1.5b + b2 = 1.729166667

Factor a perfect square on the left side:
(b + 0.75)(b + 0.75) = 1.729166667

Calculate the square root of the right side: 1.31497782

Break this problem into two subproblems by setting 
(b + 0.75) equal to 1.31497782 and -1.31497782.

Subproblem 1

b + 0.75 = 1.31497782 Simplifying b + 0.75 = 1.31497782 Reorder the terms: 0.75 + b = 1.31497782 Solving 0.75 + b = 1.31497782 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 = 1.31497782 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + b = 1.31497782 + -0.75 b = 1.31497782 + -0.75 Combine like terms: 1.31497782 + -0.75 = 0.56497782 b = 0.56497782 Simplifying b = 0.56497782

Subproblem 2

b + 0.75 = -1.31497782 Simplifying b + 0.75 = -1.31497782 Reorder the terms: 0.75 + b = -1.31497782 Solving 0.75 + b = -1.31497782 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 = -1.31497782 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + b = -1.31497782 + -0.75 b = -1.31497782 + -0.75 Combine like terms: -1.31497782 + -0.75 = -2.06497782 b = -2.06497782 Simplifying b = -2.06497782

Solution

The solution to the problem is based on the solutions from the subproblems. b = {0.56497782, -2.06497782}

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