3x(x+2)=-18

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Solution for 3x(x+2)=-18 equation:


Simplifying
3x(x + 2) = -18

Reorder the terms:
3x(2 + x) = -18
(2 * 3x + x * 3x) = -18
(6x + 3x2) = -18

Solving
6x + 3x2 = -18

Solving for variable 'x'.

Reorder the terms:
18 + 6x + 3x2 = -18 + 18

Combine like terms: -18 + 18 = 0
18 + 6x + 3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(6 + 2x + x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(6 + 2x + x2)' equal to zero and attempt to solve: Simplifying 6 + 2x + x2 = 0 Solving 6 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-6' to each side of the equation. 6 + 2x + -6 + x2 = 0 + -6 Reorder the terms: 6 + -6 + 2x + x2 = 0 + -6 Combine like terms: 6 + -6 = 0 0 + 2x + x2 = 0 + -6 2x + x2 = 0 + -6 Combine like terms: 0 + -6 = -6 2x + x2 = -6 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = -6 + 1 Reorder the terms: 1 + 2x + x2 = -6 + 1 Combine like terms: -6 + 1 = -5 1 + 2x + x2 = -5 Factor a perfect square on the left side: (x + 1)(x + 1) = -5 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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