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pakai polinomial
rumus : a³+3a²b+3ab²+b³
a = 2x
b= 4
(2x)³+3(2x)²(4)+3(2x)(4)²+(4)³
= 4x³+48x²+96x+64
=3x³+3(9x²)(4)+3(3x)(16)+64
=3x³+108x²+144x+64