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DEM5056 Quiz 1

Total questions: 10

Worksheet time: 14mins

Name
Class
Date
1.

Find the domain of the function h(x)=x−4x3−25xh\left(x\right)=\frac{x-4}{x^3-25x}  

a)

 {x∥x≠4}\left\{x\parallel x\ne4\right\}  

b)

 {x∥x≠25}\left\{x\parallel x\ne25\right\}  

c)

 {x∥x≠−5,0,5}\left\{x\parallel x\ne-5,0,5\right\}  

d)

all real numbers

2.

Find the inverse function of f.    f(x)=3x−2x+5f\left(x\right)=\frac{3x-2}{x+5}  

a)

 f−1(x)=3x+2x−5f^{-1}\left(x\right)=\frac{3x+2}{x-5}  

b)

 f−1(x)=5x+23−xf^{-1}\left(x\right)=\frac{5x+2}{3-x}  

c)

 f−1(x)=5x+23+xf^{-1}\left(x\right)=\frac{5x+2}{3+x}  

d)

 f−1(x)=x+53x−2f^{-1}\left(x\right)=\frac{x+5}{3x-2}  

3.

Find the domain of the function  f(x)=24−xf\left(x\right)=\sqrt{24-x}  

a)

 x≠24x\ne24  

b)

 x=24x=24  

c)

 x≤24x\le24  

d)

 x≥24x\ge24  

4.

Find the domain of the function f(x)=x2+9f\left(x\right)=x^2+9  

a)

 x≠−9x\ne-9  

b)

 x>−9x>-9  

c)

 x≥−9x\ge-9  

d)

all real numbers

5.

Find the derivatives  s=sin⁡t−e−ts=\sin t-e^{-t}  

a)

 dsdt=−cos⁡t−e−t\frac{ds}{dt}=-\cos t-e^{-t}  

b)

 dsdt=cos⁡t+e−t\frac{ds}{dt}=\cos t+e^{-t}  

c)

 dsdt=cos⁡t−e−t\frac{ds}{dt}=\cos t-e^{-t}  

d)

 dsdt=−cos⁡t+e−t\frac{ds}{dt}=-\cos t+e^{-t}  

6.

Given  y=sin⁡uy=\sin u ,  u=9x+12u=9x+12  find dydx\frac{dy}{dx}  

a)

 dydx=cos⁡(9x+12)\frac{dy}{dx}=\cos\left(9x+12\right)  

b)

 dydx=9cos⁡(9x+12)\frac{dy}{dx}=9\cos\left(9x+12\right)  

c)

 dydx=−9cos⁡(9x+12)\frac{dy}{dx}=-9\cos\left(9x+12\right)  

d)

 dydx=−cos⁡(9x+12)\frac{dy}{dx}=-\cos\left(9x+12\right)  

7.

Find the derivatives of the function, then calculate the value of the derivatives as specified
  g(x)=x3+5xg\left(x\right)=x^3+5x  ; g′(1)g'\left(1\right)  

a)

 g′(x)=3x2+5g'\left(x\right)=3x^2+5  , g′(1)=8g'\left(1\right)=8  

b)

 g′(x)=3x2+5xg'\left(x\right)=3x^2+5x  , g′(1)=8g'\left(1\right)=8  

c)

 g′(x)=3x2g'\left(x\right)=3x^2  , g′(x)=3g'\left(x\right)=3  

d)

 g′(x)=x2+5g'\left(x\right)=x^2+5  , g′(1)=6g'\left(1\right)=6  

8.

Find the derivatives of the function

 r=(1+9θ9θ)(9−θ)r=\left(\frac{1+9\theta}{9\theta}\right)\left(9-\theta\right)  

a)

 drdθ=θ2−1\frac{dr}{d\theta}=\theta^2-1  

b)

 drdθ=1θ2+9\frac{dr}{d\theta}=\frac{1}{\theta^2}+9  

c)

 drdθ=−1θ2−1\frac{dr}{d\theta}=-\frac{1}{\theta^2}-1  

d)

 drdθ=1θ2+1\frac{dr}{d\theta}=\frac{1}{\theta^2}+1  

9.

 lim⁡x→1(1x−1−2x2−1)=?\lim_{x\rightarrow1}\left(\frac{1}{x-1}-\frac{2}{x^2-1}\right)=?  

a)

 13\frac{1}{3}  

b)

does not exist

c)

 12\frac{1}{2}  

d)

2

10.

 lim⁡x→2(x3−8x−2)= ?\lim_{x\rightarrow2}\left(\frac{x^3-8}{x-2}\right)=\ ?  

a)

0

b)

 ∞\infty  

c)

12

d)

 112\frac{1}{12}