math
posted by Mary Anna .
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+3xy4y^2 inches. Write an algebraic expression for the area of such a whiteboard, simplify it, and include correct units with your solution

math 
Reiny
area = length x width
= (x+5y)(x^2 + 3xy  4y^2)
expand, and collect like terms.
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