.........__
-3(-3+x-y)
solve it......
when x=-2 & y=1...
there is bar (vinculum) on "x-y
-3(-3+x-y)
solve it......
when x=-2 & y=1...
there is bar (vinculum) on "x-y
-
-3( -3 - 2 -1)
-3(-6)
+18
-3(-6)
+18
-
-3[ -3 - 2 -1]
-3[-6]
= + 18
:)
-3[-6]
= + 18
:)