priatnadobi
^2log(x-2)-^4log(2x^2-12x+19)=0 (2.^4log(x-2))-^4log(2x^2-12x+19)=0 ^4log(x-2)^2-^4log(2x^2-12x+19)=0 ^4log((x-2)^2/(2x^2-12x+19))=^4log1 berarti (x-2)^2=2x^2-12x+19 x^2-4x+4=2x^2-12x+19 x^2-8x+15=0 (x-5)(x-3)=0 .. Berarti a=3 b=5 maka nilai 2a-b=2(3)-(5)=1..(b)
(2.^4log(x-2))-^4log(2x^2-12x+19)=0
^4log(x-2)^2-^4log(2x^2-12x+19)=0
^4log((x-2)^2/(2x^2-12x+19))=^4log1
berarti
(x-2)^2=2x^2-12x+19
x^2-4x+4=2x^2-12x+19
x^2-8x+15=0
(x-5)(x-3)=0
..
Berarti
a=3
b=5
maka nilai 2a-b=2(3)-(5)=1..(b)