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Perform the requested operation or operations. f(x) = 4x + 7, g(x) = 3x^2 Find (f + g)(x).

Mathematics
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4x + 7 + 3x^2
Almost. You lost the "f(x) = " and you probably shoudl re-arrange to standard form.
would it be 12x^3 +21x

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wait sorry no 4x+7-3x^2
No. You must learn to recognize "like" terms. x + x = 2x 2x^2 + x^2 = 3x^2 3x^2 - x cannot be simplified. The total of all variable exponents is an important part of "like" term.
4x+7/3x^2
I'm pretty puzzled by this. You had it right in the first place. Why did you try four other things after that? Why would it lead to division?! I suggested ONLY that you work on your notation.

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