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If r(x)=4x-3x+7, find r(3a)

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1 Answer

If i understand correctly, you are solving:

r(3a2) when r(x) = 4x2 - 3x + 7


Replace all values of x in r(x) with 3a2

4(3a2)2 - 3(3a2) + 7

4(9a4) - 9a2 + 7

36a4 - 9a2 + 7