Soru
Let f(x)=sqrt (x)-5 Then lim _(harrow 0)(f(2+h)-f(2))/(h)=
Çözüm
3.8
(182 Oylar)
Levent
Usta · 5 yıl öğretmeni
Uzman doğrulaması
Cevap
To find the limit \(\lim_{h \to 0} \frac{f(2+h) - f(2)}{h}\), we first need to determine the function \(f(x)\) and then evaluate the difference quotient.Given \(f(x) = \sqrt{x} - 5\), we can find \(f(2)\) and \(f(2+h)\):
Now, we can substitute these values into the difference quotient:
Simplifying the numerator, we have:
To evaluate this limit, we can use the conjugate method. Multiply the numerator and denominator by the conjugate of the numerator:
This simplifies to:
As
approaches 0,
approaches
. Therefore, the limit is:
So, the correct answer is
.