6r(r+8)=11

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Solution for 6r(r+8)=11 equation:


Simplifying
6r(r + 8) = 11

Reorder the terms:
6r(8 + r) = 11
(8 * 6r + r * 6r) = 11
(48r + 6r2) = 11

Solving
48r + 6r2 = 11

Solving for variable 'r'.

Reorder the terms:
-11 + 48r + 6r2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 48r + 6r2 = 0

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

Divide each side by '6'.
-1.833333333 + 8r + r2 = 0

Move the constant term to the right:

Add '1.833333333' to each side of the equation.
-1.833333333 + 8r + 1.833333333 + r2 = 0 + 1.833333333

Reorder the terms:
-1.833333333 + 1.833333333 + 8r + r2 = 0 + 1.833333333

Combine like terms: -1.833333333 + 1.833333333 = 0.000000000
0.000000000 + 8r + r2 = 0 + 1.833333333
8r + r2 = 0 + 1.833333333

Combine like terms: 0 + 1.833333333 = 1.833333333
8r + r2 = 1.833333333

The r term is 8r.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8r + 16 + r2 = 1.833333333 + 16

Reorder the terms:
16 + 8r + r2 = 1.833333333 + 16

Combine like terms: 1.833333333 + 16 = 17.833333333
16 + 8r + r2 = 17.833333333

Factor a perfect square on the left side:
(r + 4)(r + 4) = 17.833333333

Calculate the square root of the right side: 4.222953153

Break this problem into two subproblems by setting 
(r + 4) equal to 4.222953153 and -4.222953153.

Subproblem 1

r + 4 = 4.222953153 Simplifying r + 4 = 4.222953153 Reorder the terms: 4 + r = 4.222953153 Solving 4 + r = 4.222953153 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + r = 4.222953153 + -4 Combine like terms: 4 + -4 = 0 0 + r = 4.222953153 + -4 r = 4.222953153 + -4 Combine like terms: 4.222953153 + -4 = 0.222953153 r = 0.222953153 Simplifying r = 0.222953153

Subproblem 2

r + 4 = -4.222953153 Simplifying r + 4 = -4.222953153 Reorder the terms: 4 + r = -4.222953153 Solving 4 + r = -4.222953153 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + r = -4.222953153 + -4 Combine like terms: 4 + -4 = 0 0 + r = -4.222953153 + -4 r = -4.222953153 + -4 Combine like terms: -4.222953153 + -4 = -8.222953153 r = -8.222953153 Simplifying r = -8.222953153

Solution

The solution to the problem is based on the solutions from the subproblems. r = {0.222953153, -8.222953153}

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