2. Selesaikan
g.
2log (2x + 5) - 2 2log 2x = 2
2log (2x + 5) - 2log (2x)2 = 2log 22
2log (2x + 5) - 2log 4x2 = 2log 4
2log ((2x + 5) / 4x2)= 2log 4
(2x + 5) / 4x2 = 4
2x + 5 = 16x2
0 = 16x2 - 2x - 5
0 = (2x + 1)(8x - 5)
2x + 1 = 0
2x = - 1
x = - 1/2
8x - 5 = 0
8x = 5
x = 5/8
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