r(r+2)=255

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Solution for r(r+2)=255 equation:


Simplifying
r(r + 2) = 255

Reorder the terms:
r(2 + r) = 255
(2 * r + r * r) = 255
(2r + r2) = 255

Solving
2r + r2 = 255

Solving for variable 'r'.

Reorder the terms:
-255 + 2r + r2 = 255 + -255

Combine like terms: 255 + -255 = 0
-255 + 2r + r2 = 0

Factor a trinomial.
(-17 + -1r)(15 + -1r) = 0

Subproblem 1

Set the factor '(-17 + -1r)' equal to zero and attempt to solve: Simplifying -17 + -1r = 0 Solving -17 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '17' to each side of the equation. -17 + 17 + -1r = 0 + 17 Combine like terms: -17 + 17 = 0 0 + -1r = 0 + 17 -1r = 0 + 17 Combine like terms: 0 + 17 = 17 -1r = 17 Divide each side by '-1'. r = -17 Simplifying r = -17

Subproblem 2

Set the factor '(15 + -1r)' equal to zero and attempt to solve: Simplifying 15 + -1r = 0 Solving 15 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1r = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -1r = 0 + -15 -1r = 0 + -15 Combine like terms: 0 + -15 = -15 -1r = -15 Divide each side by '-1'. r = 15 Simplifying r = 15

Solution

r = {-17, 15}

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