ա 14² = 196
x = 2

գ 2^x+3*25^x-1/4^x*5^x=
2^x*2³*25^x*25^-1/(4*5)^x=5
(2*25)^x*2³*1/25/(4*5)^x=5
(50/20)^x*5/2³*25
(5/2)^x=5³/2³
(5/2)^x=(5/3)³
x=3