Question

r ezolvati ecuatile a) 2n-1=17 b) 3n+1=16 c) 7x(3n+1)=4x(5n+2) d 4x(25n-1)=9x(11n+2)

Answer 1

a) 2n-1=17=>2n=17+1=>2n=18=>n=18:2=>n=9
b)3n+1=16=>3n=16-1=>3n=15=>n=15:3=>n=5
c)7(3n+1)=4(5n+2)=>21n+7=20n+8=>n=1
d)4(25n-1)=9(11n+2)=>100n-4=99n+18=>n=14

Answer 2

a) 2n-1=17=>2n=17+1=>2n=18=>n=18:2
n=9
b)3n+1=16=>3n=16-1=>3n=15=>n=15:3
n=5
c)7(3n+1)=4(5n+2)=>21n+7=20n+8
n=1
d)4(25n-1)=9(11n+2)=>100n-4=99n+18
n=14