Find the coefficient of x2 in (3x

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Algebra

Question:

Find the coefficient of x² in (3x + y)³

Options:

27x

27y

Correct Answer:

27y

Explanation:

(3x + y)³ = 27x³ + y³ + 9xy (3x + y)

= 27x³ + y³ + 27yx² + 6xy²

⇒ Coefficient of x² = 27y