Which of the following is equal to the average (arithmetic mean) of (x+5)^2 and (x-5)^2?\nOptions:\n(A) x^2\n(B) x^2+2\n(C) x^2 +30\n(D) x^2+20\n(E) x^2+25 Hmmm, my stream of consciousness:
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Avg = [(x+5)^2 + (x-5)^2] / 2\nExpanding and simplifying, (x^2 + 10x + 25 + x^2 - 10x + 25) / 2 = x^2 + 25 So, the answer is (E).
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