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4^x. 4 + 11. 2^x - 3 =0
(2^x)^2 . 4 + 11 (2^x) - 3 = 0
misalkan 2^x = a --> x = 2'log a dan a> 0
4 a^2 + 11 a -3 = 0
(4a- 1)(a+3) = 0
a = 1/4 atau a = - 3(TM)
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x = 2'log 1/4 --> x = 2'log 2^-2
x = -2