Question

let a#b#c#d be defined for all numbers by a#b#c#d=ab-cd,if x=6#3#5#4 then what is the value of 7#x#3#11?

Answer 1

What happened to showing effort ;p

Answer 2

First find x by the definition you gave:
\[x = 6\#3\#5\#4 \implies x = 6(3) - 5(4) = 18 - 20 = -2\]
Then plug in this value and do it again for those other numbers.

Answer 3

then,i need to plug x=-2 into 7#x#3#7

Answer 4

thanks again