Only one of the pairs can be added to give a single term. Which pair is it, and what is that term?

Question

Accepted Answer

Pair A, giving 4x²y. In A, -2yx^2 = -2x^2y, so A is a pair of like terms: 6x^2y + (-2x^2y) = 4x^2y. Using +2 gives 8x^2y. B, C and D have different letters or powers, so they stay as two terms.

Only one of the pairs can be added to give a single term. Which pair is it, and what is that term?

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