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+ = 98
- 2. . = 98
- 2 = 98
= 98 + 2
= 100
+ =
+ = 10 atau + = - 10
3^2x + 3^ -2x = 98
(3^x + 3^-x)^2 - 2(3^x)(3^-x) = 98
(3^x + 3^ -1)^2 - 2(1) = 98
(3^x + 3^-1) = 100
(3^x + 3^ -x) = 10