SOLUTION: Everyone has helped me so much on this site. You all are life savers. I have another word problem . A school designer wants to create a whiteboard with the optimal dimensions to

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Question 364109: Everyone has helped me so much on this site. You all are life savers. I have another word problem
. A school designer wants to create a whiteboard with the optimal dimensions to enhance learning. It is determined that if one side of the whiteboard is x + 5y inches, the other side should be x^2 - 5xy -4y^2 inches. Write an algebraic expression for the area of such a whiteboard, simplify it, and include correct units with your solution. I multiplied and my answer is x^3 - 20y^3 - 29xy^2. Did I do this correctly or am I totally wrong?? Thanks for the help
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi, 

A =(x + 5y)in( x^2 - 5xy -4y^2)in = x( x^2 - 5xy -4y^2) + 5y( x^2 - 5xy -4y^2)

Yes! simplifying results in:

x^3 - 20y^3 - 29xy^2

Area will be in in^2

A+=+x%5E3in%5E2+-+29xy%5E2in%5E2+-+20y%5E3in%5E2