SOLUTION: 8. Essay: Show all work. 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 +

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: 8. Essay: Show all work. 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 +       Log On


   



Question 503702: 8. Essay: Show all work. 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+3xy-4y^2 inches. Write an algebraic expression for the area of such a whiteboard, simplify it, and include correct units with your solution.


I definitely need some help please!!!

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The area is the product of the 2 sides
+%28+x+%2B+5y+%29%2A%28+x%5E2+%2B+3x%2Ay+-+4y%5E2+%29+
+%28+x+%2B+5y+%29%2A%28+x+%2B+4y+%29%2A%28+x+-+y+%29+ square inches
I did the factoring by trial and error