Westonci.ca connects you with experts who provide insightful answers to your questions. Join us today and start learning! Get expert answers to your questions quickly and accurately from our dedicated community of professionals. Experience the ease of finding precise answers to your questions from a knowledgeable community of experts.

Let f be a decreasing function such that f(0) = 4 and f'(0)= 1 / 3. Which of the following is true about its inverse h? h'(0)= 1/3h ′(4) = 3h ′(4) = 0h'(1/3)= 4

Sagot :

Given:

[tex]f(0)=4_{}[/tex][tex]f^{\prime}(0)=\frac{1}{3}[/tex]

We get the point (0,4) from f(0)=4.

we get the slope m=1/3 from f'(0)=1/3.

The point-slope formula is

[tex]y-y_1=m(x-x_1)[/tex][tex]\text{ Substitute }y_1=4,x_1=0\text{ and m=}\frac{1}{3},\text{ we get}[/tex]

[tex]y-4=\frac{1}{3}(x-0)[/tex]

[tex]y-4=\frac{1}{3}x[/tex][tex]\text{Let y=f(x) and substitute x=f}^{-1}(y)[/tex]

[tex]y-4=\frac{1}{3}f^{-1}(y)[/tex]

[tex]3(y-4)=f^{-1}(y)[/tex]

Replace y by x, we get

[tex]f^{-1}(x)=3(x-4)[/tex][tex]Let\text{ }f^{-1}(x)=h(x)[/tex][tex]h(x)=3(x-4)[/tex]

Differentiate with respect to x, we get

[tex]h^{\prime}(x)=3[/tex]

Hence the answer is

[tex]h^{\prime}(4)=3[/tex]