9(6b+5)-4b(b+3)=

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Solution for 9(6b+5)-4b(b+3)= equation:


Simplifying
9(6b + 5) + -4b(b + 3) = 0

Reorder the terms:
9(5 + 6b) + -4b(b + 3) = 0
(5 * 9 + 6b * 9) + -4b(b + 3) = 0
(45 + 54b) + -4b(b + 3) = 0

Reorder the terms:
45 + 54b + -4b(3 + b) = 0
45 + 54b + (3 * -4b + b * -4b) = 0
45 + 54b + (-12b + -4b2) = 0

Combine like terms: 54b + -12b = 42b
45 + 42b + -4b2 = 0

Solving
45 + 42b + -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'.
-11.25 + -10.5b + b2 = 0

Move the constant term to the right:

Add '11.25' to each side of the equation.
-11.25 + -10.5b + 11.25 + b2 = 0 + 11.25

Reorder the terms:
-11.25 + 11.25 + -10.5b + b2 = 0 + 11.25

Combine like terms: -11.25 + 11.25 = 0.00
0.00 + -10.5b + b2 = 0 + 11.25
-10.5b + b2 = 0 + 11.25

Combine like terms: 0 + 11.25 = 11.25
-10.5b + b2 = 11.25

The b term is -10.5b.  Take half its coefficient (-5.25).
Square it (27.5625) and add it to both sides.

Add '27.5625' to each side of the equation.
-10.5b + 27.5625 + b2 = 11.25 + 27.5625

Reorder the terms:
27.5625 + -10.5b + b2 = 11.25 + 27.5625

Combine like terms: 11.25 + 27.5625 = 38.8125
27.5625 + -10.5b + b2 = 38.8125

Factor a perfect square on the left side:
(b + -5.25)(b + -5.25) = 38.8125

Calculate the square root of the right side: 6.229967897

Break this problem into two subproblems by setting 
(b + -5.25) equal to 6.229967897 and -6.229967897.

Subproblem 1

b + -5.25 = 6.229967897 Simplifying b + -5.25 = 6.229967897 Reorder the terms: -5.25 + b = 6.229967897 Solving -5.25 + b = 6.229967897 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '5.25' to each side of the equation. -5.25 + 5.25 + b = 6.229967897 + 5.25 Combine like terms: -5.25 + 5.25 = 0.00 0.00 + b = 6.229967897 + 5.25 b = 6.229967897 + 5.25 Combine like terms: 6.229967897 + 5.25 = 11.479967897 b = 11.479967897 Simplifying b = 11.479967897

Subproblem 2

b + -5.25 = -6.229967897 Simplifying b + -5.25 = -6.229967897 Reorder the terms: -5.25 + b = -6.229967897 Solving -5.25 + b = -6.229967897 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '5.25' to each side of the equation. -5.25 + 5.25 + b = -6.229967897 + 5.25 Combine like terms: -5.25 + 5.25 = 0.00 0.00 + b = -6.229967897 + 5.25 b = -6.229967897 + 5.25 Combine like terms: -6.229967897 + 5.25 = -0.979967897 b = -0.979967897 Simplifying b = -0.979967897

Solution

The solution to the problem is based on the solutions from the subproblems. b = {11.479967897, -0.979967897}

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