Question

b+c=97
a=12
ab+ac=??

Answer 1

12b+12c=x
12(b=c)=x
12 x 97 = x
x= 1164

Answer 2

$b+c=97 \\ a=12 \\ ab+ac=a(b+c)=12 \cdot 97=1164 \\ \boxed{ab+ac=1164}$