1
x>0
log(4)x=a
2a²+5a=3=0
D=25+24=49
a1=(-5-7)/4=-3⇒log(4)x=-3⇒x=1/64
a2=(-5+7)/4=1/2⇒log(4)x=1/2⇒x=2
2
x>0
log(3)x=a
a²-a-6=0
a1+a2=1 U a1*a2=-6
a1=-2⇒log(3)x=-2⇒x=1/9
a2=3⇒log(30x=3⇒x=27
3
x>0
log(1/8)x=a
3a²+5a-2=0
D=25+24=49
a1=(-5-7)/6=-2⇒log(1/8)x=-2⇒x=64
a2=(-5+7)/6=1/3⇒log(1/8)x=1/3⇒x=1/2