(5r+6)5r-6=

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Solution for (5r+6)5r-6= equation:


Simplifying
(5r + 6) * 5r + -6 = 0

Reorder the terms:
(6 + 5r) * 5r + -6 = 0

Reorder the terms for easier multiplication:
5r(6 + 5r) + -6 = 0
(6 * 5r + 5r * 5r) + -6 = 0
(30r + 25r2) + -6 = 0

Reorder the terms:
-6 + 30r + 25r2 = 0

Solving
-6 + 30r + 25r2 = 0

Solving for variable 'r'.

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

Divide each side by '25'.
-0.24 + 1.2r + r2 = 0

Move the constant term to the right:

Add '0.24' to each side of the equation.
-0.24 + 1.2r + 0.24 + r2 = 0 + 0.24

Reorder the terms:
-0.24 + 0.24 + 1.2r + r2 = 0 + 0.24

Combine like terms: -0.24 + 0.24 = 0.00
0.00 + 1.2r + r2 = 0 + 0.24
1.2r + r2 = 0 + 0.24

Combine like terms: 0 + 0.24 = 0.24
1.2r + r2 = 0.24

The r term is 1.2r.  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.
1.2r + 0.36 + r2 = 0.24 + 0.36

Reorder the terms:
0.36 + 1.2r + r2 = 0.24 + 0.36

Combine like terms: 0.24 + 0.36 = 0.6
0.36 + 1.2r + r2 = 0.6

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

Calculate the square root of the right side: 0.774596669

Break this problem into two subproblems by setting 
(r + 0.6) equal to 0.774596669 and -0.774596669.

Subproblem 1

r + 0.6 = 0.774596669 Simplifying r + 0.6 = 0.774596669 Reorder the terms: 0.6 + r = 0.774596669 Solving 0.6 + r = 0.774596669 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + r = 0.774596669 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + r = 0.774596669 + -0.6 r = 0.774596669 + -0.6 Combine like terms: 0.774596669 + -0.6 = 0.174596669 r = 0.174596669 Simplifying r = 0.174596669

Subproblem 2

r + 0.6 = -0.774596669 Simplifying r + 0.6 = -0.774596669 Reorder the terms: 0.6 + r = -0.774596669 Solving 0.6 + r = -0.774596669 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + r = -0.774596669 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + r = -0.774596669 + -0.6 r = -0.774596669 + -0.6 Combine like terms: -0.774596669 + -0.6 = -1.374596669 r = -1.374596669 Simplifying r = -1.374596669

Solution

The solution to the problem is based on the solutions from the subproblems. r = {0.174596669, -1.374596669}

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