0=r^2+6r-50.25

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Solution for 0=r^2+6r-50.25 equation:


Simplifying
0 = r2 + 6r + -50.25

Reorder the terms:
0 = -50.25 + 6r + r2

Solving
0 = -50.25 + 6r + r2

Solving for variable 'r'.

Combine like terms: 0 + 50.25 = 50.25
50.25 + -6r + -1r2 = -50.25 + 6r + r2 + 50.25 + -6r + -1r2

Reorder the terms:
50.25 + -6r + -1r2 = -50.25 + 50.25 + 6r + -6r + r2 + -1r2

Combine like terms: -50.25 + 50.25 = 0.00
50.25 + -6r + -1r2 = 0.00 + 6r + -6r + r2 + -1r2
50.25 + -6r + -1r2 = 6r + -6r + r2 + -1r2

Combine like terms: 6r + -6r = 0
50.25 + -6r + -1r2 = 0 + r2 + -1r2
50.25 + -6r + -1r2 = r2 + -1r2

Combine like terms: r2 + -1r2 = 0
50.25 + -6r + -1r2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-50.25 + 6r + r2 = 0

Move the constant term to the right:

Add '50.25' to each side of the equation.
-50.25 + 6r + 50.25 + r2 = 0 + 50.25

Reorder the terms:
-50.25 + 50.25 + 6r + r2 = 0 + 50.25

Combine like terms: -50.25 + 50.25 = 0.00
0.00 + 6r + r2 = 0 + 50.25
6r + r2 = 0 + 50.25

Combine like terms: 0 + 50.25 = 50.25
6r + r2 = 50.25

The r term is 6r.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6r + 9 + r2 = 50.25 + 9

Reorder the terms:
9 + 6r + r2 = 50.25 + 9

Combine like terms: 50.25 + 9 = 59.25
9 + 6r + r2 = 59.25

Factor a perfect square on the left side:
(r + 3)(r + 3) = 59.25

Calculate the square root of the right side: 7.697402159

Break this problem into two subproblems by setting 
(r + 3) equal to 7.697402159 and -7.697402159.

Subproblem 1

r + 3 = 7.697402159 Simplifying r + 3 = 7.697402159 Reorder the terms: 3 + r = 7.697402159 Solving 3 + r = 7.697402159 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + r = 7.697402159 + -3 Combine like terms: 3 + -3 = 0 0 + r = 7.697402159 + -3 r = 7.697402159 + -3 Combine like terms: 7.697402159 + -3 = 4.697402159 r = 4.697402159 Simplifying r = 4.697402159

Subproblem 2

r + 3 = -7.697402159 Simplifying r + 3 = -7.697402159 Reorder the terms: 3 + r = -7.697402159 Solving 3 + r = -7.697402159 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + r = -7.697402159 + -3 Combine like terms: 3 + -3 = 0 0 + r = -7.697402159 + -3 r = -7.697402159 + -3 Combine like terms: -7.697402159 + -3 = -10.697402159 r = -10.697402159 Simplifying r = -10.697402159

Solution

The solution to the problem is based on the solutions from the subproblems. r = {4.697402159, -10.697402159}

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