3x^2=-21x-18

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Solution for 3x^2=-21x-18 equation:


Simplifying
3x2 = -21x + -18

Reorder the terms:
3x2 = -18 + -21x

Solving
3x2 = -18 + -21x

Solving for variable 'x'.

Reorder the terms:
18 + 21x + 3x2 = -18 + -21x + 18 + 21x

Reorder the terms:
18 + 21x + 3x2 = -18 + 18 + -21x + 21x

Combine like terms: -18 + 18 = 0
18 + 21x + 3x2 = 0 + -21x + 21x
18 + 21x + 3x2 = -21x + 21x

Combine like terms: -21x + 21x = 0
18 + 21x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(6 + 7x + x2) = 0

Factor a trinomial.
3((6 + x)(1 + x)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(6 + x)' equal to zero and attempt to solve: Simplifying 6 + x = 0 Solving 6 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 0 + -6 Combine like terms: 6 + -6 = 0 0 + x = 0 + -6 x = 0 + -6 Combine like terms: 0 + -6 = -6 x = -6 Simplifying x = -6

Subproblem 2

Set the factor '(1 + x)' equal to zero and attempt to solve: Simplifying 1 + x = 0 Solving 1 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0 + -1 x = 0 + -1 Combine like terms: 0 + -1 = -1 x = -1 Simplifying x = -1

Solution

x = {-6, -1}

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