r^2+10r=1

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Solution for r^2+10r=1 equation:


Simplifying
r2 + 10r = 1

Reorder the terms:
10r + r2 = 1

Solving
10r + r2 = 1

Solving for variable 'r'.

Reorder the terms:
-1 + 10r + r2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 10r + r2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 10r + 1 + r2 = 0 + 1

Reorder the terms:
-1 + 1 + 10r + r2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 10r + r2 = 0 + 1
10r + r2 = 0 + 1

Combine like terms: 0 + 1 = 1
10r + r2 = 1

The r term is 10r.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10r + 25 + r2 = 1 + 25

Reorder the terms:
25 + 10r + r2 = 1 + 25

Combine like terms: 1 + 25 = 26
25 + 10r + r2 = 26

Factor a perfect square on the left side:
(r + 5)(r + 5) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(r + 5) equal to 5.099019514 and -5.099019514.

Subproblem 1

r + 5 = 5.099019514 Simplifying r + 5 = 5.099019514 Reorder the terms: 5 + r = 5.099019514 Solving 5 + r = 5.099019514 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + r = 5.099019514 + -5 Combine like terms: 5 + -5 = 0 0 + r = 5.099019514 + -5 r = 5.099019514 + -5 Combine like terms: 5.099019514 + -5 = 0.099019514 r = 0.099019514 Simplifying r = 0.099019514

Subproblem 2

r + 5 = -5.099019514 Simplifying r + 5 = -5.099019514 Reorder the terms: 5 + r = -5.099019514 Solving 5 + r = -5.099019514 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + r = -5.099019514 + -5 Combine like terms: 5 + -5 = 0 0 + r = -5.099019514 + -5 r = -5.099019514 + -5 Combine like terms: -5.099019514 + -5 = -10.099019514 r = -10.099019514 Simplifying r = -10.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. r = {0.099019514, -10.099019514}

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