



 
Hi Roxanne, There is some number x which you don't know but you are being told that the rectangle is 3 times x units long and 4 times x units wide. The area of a rectangle is its length times its width so the area of this rectangle is
If I use the × symbol for multiplication this is
3 × 4 = 12 and x × x can be written x^{2} and hence the area of the rectangle can be written
Many times in algebraic notation we don't write the × for multiplication, we just write the quantities to be multiplied adjacent to each other. Thus I might write the area of the rectangle
I hope this helps,  


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