Question

v(u-1) for u=9 and v=8

Answer 1

are you suppose to be using a specific property?

Answer 2

for this...they give you values for 'v' and for 'u'

so you take your equation

v(u - 1)

and you replace 'v' and 'u' with the values you were given

8(9-1)

and solve

Answer 3

substitute u for 9 and v for 8
then you have
8(9-1) = 8(8) = 64