Question

resolva a equação An,1,2=30 ​

Answer 1

A(n-1 , 2) =30

(n-1).(n-2)=30

n² -3n +2 =30

n² -3n -28 = 0

∆=(-3)² -4.1.(-28)= 9 +112=121 => √∆=11

n' = -b+√∆/2a = 3+11/2=14/2 = 7 ✓