Question

Aratati ca ( 3n + 7 ; 4n +9 ) = 1, oricare ar fi n ∈ N.
Repede, va rog!

Answer 1

$3n+7=1 => 3n=-6 => n= \frac{-6}{3} => n=-3$
$4n+9=1 => 4n=-8 => n= \frac{-8}{4} => n=-2$