r^2-37=-10r

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Solution for r^2-37=-10r equation:


Simplifying
r2 + -37 = -10r

Reorder the terms:
-37 + r2 = -10r

Solving
-37 + r2 = -10r

Solving for variable 'r'.

Reorder the terms:
-37 + 10r + r2 = -10r + 10r

Combine like terms: -10r + 10r = 0
-37 + 10r + r2 = 0

Begin completing the square.

Move the constant term to the right:

Add '37' to each side of the equation.
-37 + 10r + 37 + r2 = 0 + 37

Reorder the terms:
-37 + 37 + 10r + r2 = 0 + 37

Combine like terms: -37 + 37 = 0
0 + 10r + r2 = 0 + 37
10r + r2 = 0 + 37

Combine like terms: 0 + 37 = 37
10r + r2 = 37

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 = 37 + 25

Reorder the terms:
25 + 10r + r2 = 37 + 25

Combine like terms: 37 + 25 = 62
25 + 10r + r2 = 62

Factor a perfect square on the left side:
(r + 5)(r + 5) = 62

Calculate the square root of the right side: 7.874007874

Break this problem into two subproblems by setting 
(r + 5) equal to 7.874007874 and -7.874007874.

Subproblem 1

r + 5 = 7.874007874 Simplifying r + 5 = 7.874007874 Reorder the terms: 5 + r = 7.874007874 Solving 5 + r = 7.874007874 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 = 7.874007874 + -5 Combine like terms: 5 + -5 = 0 0 + r = 7.874007874 + -5 r = 7.874007874 + -5 Combine like terms: 7.874007874 + -5 = 2.874007874 r = 2.874007874 Simplifying r = 2.874007874

Subproblem 2

r + 5 = -7.874007874 Simplifying r + 5 = -7.874007874 Reorder the terms: 5 + r = -7.874007874 Solving 5 + r = -7.874007874 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 = -7.874007874 + -5 Combine like terms: 5 + -5 = 0 0 + r = -7.874007874 + -5 r = -7.874007874 + -5 Combine like terms: -7.874007874 + -5 = -12.874007874 r = -12.874007874 Simplifying r = -12.874007874

Solution

The solution to the problem is based on the solutions from the subproblems. r = {2.874007874, -12.874007874}

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