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mis 2^x=p
jdi p^2-2p=8
atau= p^2-2p-8=0
difaktorkan
(p-4) atau (p+2)= 0
jdi p= 4 atau p= -2
utk p= 4
2^x=p
2^x=4
2^x=2^2
x=2
utk p=-2 tdak memenuhi.