(r+3)(2r+9)=2

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Solution for (r+3)(2r+9)=2 equation:


Simplifying
(r + 3)(2r + 9) = 2

Reorder the terms:
(3 + r)(2r + 9) = 2

Reorder the terms:
(3 + r)(9 + 2r) = 2

Multiply (3 + r) * (9 + 2r)
(3(9 + 2r) + r(9 + 2r)) = 2
((9 * 3 + 2r * 3) + r(9 + 2r)) = 2
((27 + 6r) + r(9 + 2r)) = 2
(27 + 6r + (9 * r + 2r * r)) = 2
(27 + 6r + (9r + 2r2)) = 2

Combine like terms: 6r + 9r = 15r
(27 + 15r + 2r2) = 2

Solving
27 + 15r + 2r2 = 2

Solving for variable 'r'.

Reorder the terms:
27 + -2 + 15r + 2r2 = 2 + -2

Combine like terms: 27 + -2 = 25
25 + 15r + 2r2 = 2 + -2

Combine like terms: 2 + -2 = 0
25 + 15r + 2r2 = 0

Factor a trinomial.
(5 + r)(5 + 2r) = 0

Subproblem 1

Set the factor '(5 + r)' equal to zero and attempt to solve: Simplifying 5 + r = 0 Solving 5 + r = 0 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 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + r = 0 + -5 r = 0 + -5 Combine like terms: 0 + -5 = -5 r = -5 Simplifying r = -5

Subproblem 2

Set the factor '(5 + 2r)' equal to zero and attempt to solve: Simplifying 5 + 2r = 0 Solving 5 + 2r = 0 Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 2r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 2r = 0 + -5 2r = 0 + -5 Combine like terms: 0 + -5 = -5 2r = -5 Divide each side by '2'. r = -2.5 Simplifying r = -2.5

Solution

r = {-5, -2.5}

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