Multiple Choice

A quality control technician is verifying a manufacturing specification for a square mounting plate with an area of $9x^2 + 12x + 4.Toconfirmtheexpressionfollowstheperfectsquaretrinomialpattern. To confirm the expression follows the perfect square trinomial pattern a^2 + 2ab + b^2, the technician must verify that the middle term ($12x) is equal to $2ab$. Which of the following shows the correct substitution for this verification?

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Updated 2026-04-21

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