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What is the simplified form of ( (x+2y)^3+(x-2y)^3 )?

Answer and explanation

Correct answer: (2x^3+24xy^2)

The correct answer is option A, \\(2x^3+24xy^2\\). Use \\( (a+b)^3+(a-b)^3=2a^3+6ab^2\\). Put \\(a=x\\) and \\(b=2y\\). Then \\(2a^3=2x^3\\), while \\(6ab^2=6\cdot x\cdot(2y)^2=6x\cdot4y^2=24xy^2\\). The terms containing an odd power of \\(b\\) cancel. A is therefore correct. B has only half of the second term. C incorrectly keeps a cube term in \\(y\\), although the two opposite cubes cancel. D contains terms of the wrong types, such as \\(x^2y\\), which do not remain after addition. A useful check is to expand both cubes: the \\(x^2y\\) and \\(y^3\\) terms cancel, leaving only \\(2x^3+24xy^2\\).

Related tags

Cube IdentitySum Of Cubes FormsSimplification

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