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(3x2+5)+(16x2+7)

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3 Answers

Do everything inside the () first. Remember that multiplication comes before addition. Do the two multiplications. So you get...
(6+5)+(32+7)
11+39=50
I assume the same as Bill, with the 2's being exponents, in which case you'd add your like terms. The x2 terms can be added (no change in power there!) and the constants can be added.