book Maths Puzzle Numerical Ability

Simplify (2x-4)(4x-2)

This is what I've done. Is this correct?
(2x*4x)(-4*-2)=8x+8

Read Solution (Total 0)

book Other Question

(-6 + 2) / (2 + 2) how do i work it ?
Thank You
nuts are sold $15.00 per kg for cashews and pecans are $10.00 per kg. How many kg of each should be mixed in order to get 20kg worth $12.00 per kg?