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2^x + 8(2^x) = 72
9(2^x) = 72
2^x = 8
x = 3
b) 3^x + 3^(x+2) = 90
3^x + 9(3^x) = 90
10(3^x) = 90
3^x = 9
x = 2
c) 4^(x+1) + 2^2x + 20 bukan persamaan
mungkin
4^(x+1) + 2^2x = 20
4(4^x) + 4^x = 20
5(4^x) = 20
4^x = 4
x = 1