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Which is the correct expansion of (xy)⁴?

Answer and explanation

Correct answer: x⁴y⁴

The governing law is the power-of-a-product rule: (ab)ⁿ = aⁿbⁿ. The exponent 4 applies to the complete product xy, so (xy)⁴ means xy · xy · xy · xy. Regrouping the x factors and y factors gives x⁴y⁴. Therefore option A is correct. Option B raises only y to the fourth power and leaves x unchanged; option C does the reverse; and option D incorrectly changes multiplication into addition. It is important not to use the separate rule (a + b)ⁿ = aⁿ + bⁿ, which is generally false. Since x and y may be any suitable numbers, the symbolic product rule is the valid simplification.

Related tags

ExponentsPower-Of-ProductAlgebraic-ExpressionOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 Mcq

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