Question

A. stiind ca a+b= -23 si c = 4, calculati a*c+b*c
B. stiind ca a+b= 18 si c = -9 calculati a*c+b*c

Answer 1

$a).a+b=-23 \\ c=4 \\ ac+bc=? \\ ac+bc=c(a+b)=4 \cdot (-23)=-92 \\ \boxed{ac+bc=-92} \\ b).a+b=18 \\ c=-9 \\ ac+bc=? \\ ac+bc=c(a+b)=-9 \cdot 18=-162 \\ \boxed{ac+bc=-162}$