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

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

anonymous · Answer

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

anonymous · Answer

Now use the information you have, it will be easy :) 

Let me know if you have any more trouble.

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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

ganeshie8 · Answer

looks it wont simplify to a number

anonymous · Answer

nope