We want to factor the following expression: 4x4 – 9y4
We can factor the expression as (U + V)(U – V) where U and V are either constant
integers or single-variable expressions.
1) What are U and V?

The price of a lawn mower is x dollars. the store is having a 75% end of summer clearance sale. which expression can be used to find the clearance price of the mower? a) .25x b) .75x c) x - .25(75) d) x + .25(75)