Question
ind the foot of perpendicular from the point (2, −1, 5) on the line
11 = y − 4 2 = − 8 x − z 11 .
if * is a binary operation on z-{-1},set of integers expect -1, by a*b=a+b+ab, prove that * is commutative and associative . also find identiy element if ot exists.