Question

solve 25^x-30(5^x) +125=0
a) x=1,2
b) x=-1,2
c) x=5,25
d)x= -5,25

Answer 1

ans : a)
5^2x-30(5^x) +125=0
put 5^x=t
t^2-30t+125=0 , solve it for t and compaire the powers you will get x=1, 2