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Anonymous
If you take the common term 4a out of the expression 16a4 + 4a3, you get 4a(4a3 + a2), making it apparent that if you divide by 4a, the quotient is (4a3 + a2).
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4a3 - 4a2 = 4a2*(a - 1)
4a*4a*4a = 64a3 cubic units
8
-4a.
4a - 9 = 27 4a = 36 a = 9