r^2+10r+9=0

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Solution for r^2+10r+9=0 equation:


Simplifying
r2 + 10r + 9 = 0

Reorder the terms:
9 + 10r + r2 = 0

Solving
9 + 10r + r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(9 + r)(1 + r) = 0

Subproblem 1

Set the factor '(9 + r)' equal to zero and attempt to solve: Simplifying 9 + r = 0 Solving 9 + r = 0 Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + r = 0 + -9 Combine like terms: 9 + -9 = 0 0 + r = 0 + -9 r = 0 + -9 Combine like terms: 0 + -9 = -9 r = -9 Simplifying r = -9

Subproblem 2

Set the factor '(1 + r)' equal to zero and attempt to solve: Simplifying 1 + r = 0 Solving 1 + r = 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 + r = 0 + -1 Combine like terms: 1 + -1 = 0 0 + r = 0 + -1 r = 0 + -1 Combine like terms: 0 + -1 = -1 r = -1 Simplifying r = -1

Solution

r = {-9, -1}

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