Let x and y be the dimensions of the rectangle. If the perimeter is 40, we have
We can expression one variable in terms of the others as
Since the area is the product of the dimensions, we have
This is a parabola facing down, so it's vertex is the maximum:
So, the maximum is
And since we know that , we have as well.
This is actually a well known theorem: out of all the rectangles with given perimeter, the one with the greatest area is the square.
i believe it would take 16. let me know if thats right?
Remember these rules for addition, substraction, multiplication or division:
+ + = +
- - = -
Big + number - = +
Big -number + = -
change the sign!
And follow the rules for addition
Multiplication or division
- - = +
+ - = -
Now for the exercise
Change the signal
what is your question I can't help you if I dont have any questions to answer