littlemusicmix495 littlemusicmix495
  • 30-09-2017
  • Mathematics
contestada

Find the value of $x$ that maximizes $f(x) = \log (-20x + 12\sqrt{x}).$ If there is no maximum value, write "NONE".

Respuesta :

meerkat18
meerkat18 meerkat18
  • 10-10-2017
The function is written as:
f(x) = log(-20x + 12√x)
To find the maximum value, differentiate the equation in terms of x, then equate it to zero. The solution is as follows.

The formula for differentiation would be:
d(log u)/dx = du/u ln(10)
Thus,
d/dx = (-20 + 6/√x)/(-20x + 12√x)(ln 10) = 0
-20 + 6/√x = 0
6/√x = 20
x = (6/20)² = 9/100

Thus,
f(x) =  log(-20(9/100)+ 12√(9/100)) = 0.2553

The maximum value of the function is 0.2553.
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