r^2+r-650=

Solution for r^2+r-650= equation:

Simplifying
r2 + r + -650 = 0

Reorder the terms:
-650 + r + r2 = 0

Solving
-650 + r + r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-26 + -1r)(25 + -1r) = 0

Subproblem 1
Set the factor '(-26 + -1r)' equal to zero and attempt to solve:

Simplifying
-26 + -1r = 0

Solving
-26 + -1r = 0

Move all terms containing r to the left, all other terms to the right.

Add '26' to each side of the equation.
-26 + 26 + -1r = 0 + 26

Combine like terms: -26 + 26 = 0
0 + -1r = 0 + 26
-1r = 0 + 26

Combine like terms: 0 + 26 = 26
-1r = 26

Divide each side by '-1'.
r = -26

Simplifying
r = -26
Subproblem 2
Set the factor '(25 + -1r)' equal to zero and attempt to solve:

Simplifying
25 + -1r = 0

Solving
25 + -1r = 0

Move all terms containing r to the left, all other terms to the right.

Add '-25' to each side of the equation.
25 + -25 + -1r = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -1r = 0 + -25
-1r = 0 + -25

Combine like terms: 0 + -25 = -25
-1r = -25

Divide each side by '-1'.
r = 25

Simplifying
r = 25
Solution
r = {-26, 25}