(a+9)(a+3)=

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Solution for (a+9)(a+3)= equation:


Simplifying
(a + 9)(a + 3) = 0

Reorder the terms:
(9 + a)(a + 3) = 0

Reorder the terms:
(9 + a)(3 + a) = 0

Multiply (9 + a) * (3 + a)
(9(3 + a) + a(3 + a)) = 0
((3 * 9 + a * 9) + a(3 + a)) = 0
((27 + 9a) + a(3 + a)) = 0
(27 + 9a + (3 * a + a * a)) = 0
(27 + 9a + (3a + a2)) = 0

Combine like terms: 9a + 3a = 12a
(27 + 12a + a2) = 0

Solving
27 + 12a + a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(9 + a)(3 + a) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(3 + a)' equal to zero and attempt to solve: Simplifying 3 + a = 0 Solving 3 + a = 0 Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + a = 0 + -3 Combine like terms: 3 + -3 = 0 0 + a = 0 + -3 a = 0 + -3 Combine like terms: 0 + -3 = -3 a = -3 Simplifying a = -3

Solution

a = {-9, -3}

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