Question

hi guys
can you help me to solve this if:
a*d=0
x*w=0
a+x=v
d+w=c
v*c= what ,i know that is not always cero but how can i prove this

Answer 1

\[v = a+x, ~~~ c = w+d,~~~~ so~~~ v \times c \implies (a+x)(w+d)\]

Answer 2

Now use the information you have, it will be easy :)

Let me know if you have any more trouble.

Answer 3

than you but im sorry is
x*w=0, not x*d=0

Answer 4

No problem, same method though :) the equation stays just foil it out and see what you get

Answer 5

ok i get v*c=(a+x)(w+d)= aw+da+xw+xd= aw+xd as da and xw equals cero
what should i do now

Answer 6

looks it wont simplify to a number

Answer 7

nope