Question

(x + y + z) (x + y - z) ?????????? what's the method to be used here?

Answer 1

mulitplication .... but they prolly want the distributive property as a definitive answer

Answer 2

you use the distributive law

firat multiply the second bracket by x, then by y and finally by. then simplify the result

Answer 3

x + y + z
x + y - z
-----------
x^2 +xy +xz
+xy +y^2 +yz
-xz -yz -z^2
--------------------------
x^2 +2xy +y^2 -z^2

Answer 4

for this consider,
((x+y)+z)((x+y)-z)=(x+y)^2-z^2=x^2+y^2+2xy-z^2