Question

Hey hey. Puteti sa ma ajutati cu un exercitiu??
"stiind ca xy + xz=280 si y + z =7 calculati x."
Multumesc frumos :*

Answer 1

$xy+xz=280 \Leftrightarrow x(y+z)=280 \Leftrightarrow x \cdot 7=280 \Rightarrow x= \frac{280}{7}=40. \\ \\ \underline{Solutie}:~x=40.$

Answer 2

x(y+z)=280
xx7=280
x=40