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4(1)+2=2(1)^2+4(1)
6=6
u/n=k+1
2k^2+4k+4(k+1)+2=2(k+1)^2+4(k+1)
2k^2+8k+6=2k^2+4k+2+4k+4
2k^2+8k+6=2k^2+8k+6 terbukti bener