Himpunan penyelesaian persamaan 3^2x+1 - 10 . 3^x + 3 = 0 adalah...
a. {-1, 1/3}
b. {-1, 1}
c. {1/3, 1}
d. {1/3, 3}
e. {1, 3}
a. {-1, 1/3}
b. {-1, 1}
c. {1/3, 1}
d. {1/3, 3}
e. {1, 3}
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3^2x . 3^1 - 10. 3^x + 3 = 0
3. (3^x)^2 - 10 (3^x) +3 = 0
misal 3^x = a
3 a^2 - 10 a + 3 = 0
(3a -1)(a-3) = 0
a = 1/3 atau a = 3
.
3^x = 1/3 ---> 3^x =3^-1 --> x = -1
3^x = 3 -----> 3^x = 3^1 ---> x = 1