X+y=50 which x and y are two positive numbers (a)for which numbers x is the product of the two numbers an increasing function of x (b)what is the maximum value of their product?
2 Answers
We can see that
p(x) = xy = x(50 - x) = 50x - x^2
Now we take the derivative.
p'(x) = 50 - 2x
Take the derivative at
0 = 50 - 2x
2x= 50
x = 25
Which means that the maximum product will happen when
Hopefully this helps!
See below.
Explanation:
Here the extremum point problem is equivalent to this one.
Given the function
determine
Choosing
but tangency implies one solution hence
and finally
b)