



 
Hi Jennifer, There is an understood multiplication symbol between the 8 and the x in 8x. Likewise there is an understood multiplication symbol between (8x) and (4). Thus you can think of (8x)(4) as (8 times x) times (4) or with symbols
Since multiplication is commutative (that is you can perform a string of multiplications in any order you want) you can write this as
Again using the convention of the understood multiplication
Thus
Now let me try the 4th problem, (6a)(3a)(b^{2}). Making the understood multiplication explicit this is
and using the commutative property of multiplication
Penny  


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