Question

Resolva a equação: A(n+3,2)=30.

Answer 1

A(n+3,2)=30.

(n+3).(n+2) = 30

n² +5n +6 = 30

n² +5n -24 = 0

∆= b² -4ac = 25 +96=121 => √∆=11

n' = -b+√∆/2a = -5+11/2 = 6/2 = 3 <==©

Answer 2

igual a : raiz de três...