Question

se stie ca: ab+ ac= 420 si b+c= 14. aflti a

Answer 1

a*b+a*c=420
b+c=14
==> a*(b+c)=420
a*14=420
a=30
Sper ca te-am ajutat !

Answer 2

$\displaystyle ab+ac=420 \\ b+c=14 \\ a=? \\ ab+ac=420 \\ a(b+c)=420 \\ 14a=420 \\ a=420:14 \\ \boxed{a=30}$