Answered

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Answer:

Correct answer is D. x^2 + 81 = x^2 + 20x + 100

Step-by-step explanation:

root x^2 + 81 = x + 10

x^2 + 81 = (x + 10) ^2

we all know (a +b)^2 is a^2 + b^2 + 2ab

x^2 + 81 = x^2 + 10^2 + 2(10x)

x^2 + 81 = x^2 + 100 + 20x

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