(x+3)(x+9)=7

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Solution for (x+3)(x+9)=7 equation:


Simplifying
(x + 3)(x + 9) = 7

Reorder the terms:
(3 + x)(x + 9) = 7

Reorder the terms:
(3 + x)(9 + x) = 7

Multiply (3 + x) * (9 + x)
(3(9 + x) + x(9 + x)) = 7
((9 * 3 + x * 3) + x(9 + x)) = 7
((27 + 3x) + x(9 + x)) = 7
(27 + 3x + (9 * x + x * x)) = 7
(27 + 3x + (9x + x2)) = 7

Combine like terms: 3x + 9x = 12x
(27 + 12x + x2) = 7

Solving
27 + 12x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
27 + -7 + 12x + x2 = 7 + -7

Combine like terms: 27 + -7 = 20
20 + 12x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
20 + 12x + x2 = 0

Factor a trinomial.
(10 + x)(2 + x) = 0

Subproblem 1

Set the factor '(10 + x)' equal to zero and attempt to solve: Simplifying 10 + x = 0 Solving 10 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 0 + -10 Combine like terms: 10 + -10 = 0 0 + x = 0 + -10 x = 0 + -10 Combine like terms: 0 + -10 = -10 x = -10 Simplifying x = -10

Subproblem 2

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

Solution

x = {-10, -2}

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