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log [(3x-4)(5)/x ]= log [(15x + 2)/(x+2)]
(3x-4)(5)/x = (15x + 2)/(x+2)
5(3x-4)(x+2) = (15x+2)(x
5(3x²+2x -8) = 15x² + 2x
15x²+10x -40 = 15x² + 2x, se simplifica 15x²
10x -2x = 40
8x = 40
x= 40/8
x=5; la correcta es la opción c
log 2x = 2 log (x – 12)
log 2x = log (x – 12)²
2x = (x – 12)²
x²-24x +144 = 2x
x²-24x +144 -2x =0
x²-26x +144 =0; descomponiendo
(x-18)(x-6) =0
x-18 =0; x-6=0
x1=18 x2= 6
La opción correcta es la a