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5^-1(5^2x) - 6.5^x + 25 = 0
(1/5)(5^x)² - 6.5^x + 25 = 0 kalikan dengan 5
(5^x)² - 30.5^x + 125 = 0
(5^x - 5)(5^x - 25) = 0
5^x = 5 atau 5^x = 25
5^x = 5^1 5^x = 5²
x = 1 x = 2
HP { 1 , 2 }