e)
8^2x+1 + 8^2x = 9 × 2^2010
8^2x × 8^1 + 8^2x = 9 × 2^2010
8^2x ( 8^1 + 1) = 9 × 2^2010
8^2x × 9 = 9 × 2^2010 | : 9
(2^3)^2x = 2^2010
2^6x = 2^2010
6x = 2010
x = 2010 : 6
x = 335
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f)
5^x + 5^x+1 + 5^x+2 = 775
5^x + 5^x × 5^1 + 5^x × 5^2 = 775
5^x ( 1 + 5^1 + 5^2) = 775
5^x ( 1 + 5 + 25) = 775
5^x × 31 = 775
5^x = 775 : 31
5^x = 25
5^x = 5^2
x = 2
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^ = simbol folosit ptr ridicarea la putere
5^x = 5 la puterea x
