Question

a×b=30sia×c=18,calculatia(b+c)

Answer 1

a*b=30
a*c=18
----------(+)
a*b+a*c=30+18
a(b+c)=48

Answer 2

$a \times b=30 \\ a \times c=18 \\ a(b+c)=a \times b+a \times c=30+18=48 \\ \boxed{a(b+c)=48}$