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Yang nomor 1
2^x + 1 = 8
2^x + 1 = 2³
x + 1 = 3
x = 3 - 1
x = 2
Yang nomor 2
3^2 - x = 27
3^2 - x = 3³
2 - x = 3
- x = 3 - 2
- x = 1
x = - 1
Yang nomor 3
2^x = 1/32
2^x = 1/2^5
2^x = 2^- 5
x = - 5
Yang nomor 4
4^x - 1 = 128
(2^2)^x - 1 = 2^7
2^2x - 2 = 2^7
2x - 2 = 7
2x = 7 + 2
2x = 9
x = 9/2