x^2+2x+21=-9x-3

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Solution for x^2+2x+21=-9x-3 equation:


Simplifying
x2 + 2x + 21 = -9x + -3

Reorder the terms:
21 + 2x + x2 = -9x + -3

Reorder the terms:
21 + 2x + x2 = -3 + -9x

Solving
21 + 2x + x2 = -3 + -9x

Solving for variable 'x'.

Reorder the terms:
21 + 3 + 2x + 9x + x2 = -3 + -9x + 3 + 9x

Combine like terms: 21 + 3 = 24
24 + 2x + 9x + x2 = -3 + -9x + 3 + 9x

Combine like terms: 2x + 9x = 11x
24 + 11x + x2 = -3 + -9x + 3 + 9x

Reorder the terms:
24 + 11x + x2 = -3 + 3 + -9x + 9x

Combine like terms: -3 + 3 = 0
24 + 11x + x2 = 0 + -9x + 9x
24 + 11x + x2 = -9x + 9x

Combine like terms: -9x + 9x = 0
24 + 11x + x2 = 0

Factor a trinomial.
(8 + x)(3 + x) = 0

Subproblem 1

Set the factor '(8 + x)' equal to zero and attempt to solve: Simplifying 8 + x = 0 Solving 8 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + x = 0 + -8 x = 0 + -8 Combine like terms: 0 + -8 = -8 x = -8 Simplifying x = -8

Subproblem 2

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

Solution

x = {-8, -3}

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