f(x) = 3^{2x} - 2xln3
f'(x)=0 <=> 3^{2x}-1=0 <=> 2x=0<=>x=0
f'(x)>0 <=> 3^{2x}-1>0 <=> 2x>0 <=> x>0
f'(x)<0 <=> 3^{2x}-1<0 <=> 2x<0 <=> x<0
f(x) = 3^{2x} - 2xln3
f'(x)=0 <=> 3^{2x}-1=0 <=> 2x=0<=>x=0
f'(x)>0 <=> 3^{2x}-1>0 <=> 2x>0 <=> x>0
f'(x)<0 <=> 3^{2x}-1<0 <=> 2x<0 <=> x<0