r^2-6r=17

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Solution for r^2-6r=17 equation:


Simplifying
r2 + -6r = 17

Reorder the terms:
-6r + r2 = 17

Solving
-6r + r2 = 17

Solving for variable 'r'.

Reorder the terms:
-17 + -6r + r2 = 17 + -17

Combine like terms: 17 + -17 = 0
-17 + -6r + r2 = 0

Begin completing the square.

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + -6r + 17 + r2 = 0 + 17

Reorder the terms:
-17 + 17 + -6r + r2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -6r + r2 = 0 + 17
-6r + r2 = 0 + 17

Combine like terms: 0 + 17 = 17
-6r + r2 = 17

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 = 17 + 9

Reorder the terms:
9 + -6r + r2 = 17 + 9

Combine like terms: 17 + 9 = 26
9 + -6r + r2 = 26

Factor a perfect square on the left side:
(r + -3)(r + -3) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(r + -3) equal to 5.099019514 and -5.099019514.

Subproblem 1

r + -3 = 5.099019514 Simplifying r + -3 = 5.099019514 Reorder the terms: -3 + r = 5.099019514 Solving -3 + r = 5.099019514 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 = 5.099019514 + 3 Combine like terms: -3 + 3 = 0 0 + r = 5.099019514 + 3 r = 5.099019514 + 3 Combine like terms: 5.099019514 + 3 = 8.099019514 r = 8.099019514 Simplifying r = 8.099019514

Subproblem 2

r + -3 = -5.099019514 Simplifying r + -3 = -5.099019514 Reorder the terms: -3 + r = -5.099019514 Solving -3 + r = -5.099019514 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 = -5.099019514 + 3 Combine like terms: -3 + 3 = 0 0 + r = -5.099019514 + 3 r = -5.099019514 + 3 Combine like terms: -5.099019514 + 3 = -2.099019514 r = -2.099019514 Simplifying r = -2.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. r = {8.099019514, -2.099019514}

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