r^2-19r=-18

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Solution for r^2-19r=-18 equation:


Simplifying
r2 + -19r = -18

Reorder the terms:
-19r + r2 = -18

Solving
-19r + r2 = -18

Solving for variable 'r'.

Reorder the terms:
18 + -19r + r2 = -18 + 18

Combine like terms: -18 + 18 = 0
18 + -19r + r2 = 0

Factor a trinomial.
(1 + -1r)(18 + -1r) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(18 + -1r)' equal to zero and attempt to solve: Simplifying 18 + -1r = 0 Solving 18 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -1r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -1r = 0 + -18 -1r = 0 + -18 Combine like terms: 0 + -18 = -18 -1r = -18 Divide each side by '-1'. r = 18 Simplifying r = 18

Solution

r = {1, 18}

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