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DUM20132 (QUIZ 2) - UNIT 3 DIFFERENTIATION

Total questions: 10

Worksheet time: 5mins

Name
Class
Date
1.

Find dydx\frac{\text{d}y}{\text{d}x} of the following function: y=8x3+3x2−11y=8x^3+3x^2-11 .

a)

dydx=2x4+3x3−11x\frac{\text{d}y}{\text{d}x}=2x^4+3x^3-11x

b)

dydx=8x2+3x −11\frac{\text{d}y}{\text{d}x}=8x^2+3x\ -11

c)

dydx=24x2+6x\frac{\text{d}y}{\text{d}x}=24x^2+6x

d)

dydx=16x3+6x2−11\frac{\text{d}y}{\text{d}x}=16x^3+6x^2-11

2.

Solve the first derivatives for, y=cos⁡(−2x)y=\cos\left(-2x\right) .

a)

dydx=2sin⁡2x\frac{\text{d}y}{\text{d}x}=2\sin2x

b)

dydx=−2sin⁡2x\frac{\text{d}y}{\text{d}x}=-2\sin2x

c)

dydx=−sin⁡(−2x)\frac{\text{d}y}{\text{d}x}=-\sin\left(-2x\right)

d)

dydx=2sin⁡(−2x)\frac{\text{d}y}{\text{d}x}=2\sin\left(-2x\right)

3.

Differentiate the followings, f(x)=ex2f\left(x\right)=e^{\frac{x}{2}} .

a)

f′(x)=ex22f'\left(x\right)=\frac{e^{\frac{x}{2}}}{2}

b)

f′(x)=2ex2f'\left(x\right)=2e^{\frac{x}{2}}

c)

f′(x)=ex212f'\left(x\right)=\frac{e^{\frac{x}{2}}}{\frac{1}{2}}

d)

f′(x)=ex2f'\left(x\right)=e^{\frac{x}{2}}

4.

The first derivatives for, y=ln⁡(2+3x)y=\ln\left(2+3x\right) is ________.

a)

dydx=1(2+3x)\frac{\text{d}y}{\text{d}x}=\frac{1}{\left(2+3x\right)}

b)

dydx=3(2+3x)\frac{\text{d}y}{\text{d}x}=\frac{3}{\left(2+3x\right)}

c)

dydx=2(2+3x)\frac{\text{d}y}{\text{d}x}=\frac{2}{\left(2+3x\right)}

d)

dydx=13(2+3x)\frac{\text{d}y}{\text{d}x}=\frac{1}{3\left(2+3x\right)}

5.

By using PRODUCT RULE, find the derivatives for y=5x(e2x)y=5x\left(e^{2x}\right) .

a)

dydx=5xe2x+5e2x\frac{\text{d}y}{\text{d}x}=5xe^{2x}+5e^{2x}

b)

dydx=10xe2x+5e2x\frac{\text{d}y}{\text{d}x}=10xe^{2x}+5e^{2x}

c)

dydx=5xe2x+10e2x\frac{\text{d}y}{\text{d}x}=5xe^{2x}+10e^{2x}

d)

dydx=10xe2x+10e2x\frac{\text{d}y}{\text{d}x}=10xe^{2x}+10e^{2x}

6.

Find the differentiation for the following, y=2x2−13x+5y=\frac{2x^2-1}{3x+5} by using QUOTIENT RULE.

a)

dydx=6x2+20x+3(3x+5)2\frac{\text{d}y}{\text{d}x}=\frac{6x^2+20x+3}{\left(3x+5\right)^2}

b)

dydx=18x2+20x+3(3x+5)2\frac{\text{d}y}{\text{d}x}=\frac{18x^2+20x+3}{\left(3x+5\right)^2}

c)

dydx=−18x2+20x−3(3x+5)2\frac{\text{d}y}{\text{d}x}=\frac{-18x^2+20x-3}{\left(3x+5\right)^2}

d)

dydx=6x2+20x−3(3x+5)2\frac{\text{d}y}{\text{d}x}=\frac{6x^2+20x-3}{\left(3x+5\right)^2}

7.

By using CHAIN RULE, differentiate the following: f(u)=(sin⁡3t)6f\left(u\right)=\left(\sin3t\right)^6 .

a)

f′(u)=6(sin⁡3t)5f'\left(u\right)=6\left(\sin3t\right)^5

b)

f′(u)=18cos⁡3t(sin⁡3t)5f'\left(u\right)=18\cos3t\left(\sin3t\right)^5

c)

f′(u)=6(cos⁡3t)5f'\left(u\right)=6\left(\cos3t\right)^5

d)

f′(u)=18cos⁡t(3sin⁡t)6f'\left(u\right)=18\cos t\left(3\sin t\right)^6

8.

By using the derivatives concept in implicit function, differentiate the following: y2=−x2+5y^2=-x^2+5 .

a)

dydx=x−5y\frac{\text{d}y}{\text{d}x}=\frac{x-5}{y}

b)

dydx=−xy2\frac{\text{d}y}{\text{d}x}=\frac{-x}{y^2}

c)

dydx=−xy\frac{\text{d}y}{\text{d}x}=\frac{-x}{y}

d)

dydx=−yx\frac{\text{d}y}{\text{d}x}=\frac{-y}{x}

9.

Determine the 4th4^{th} derivative for : f(x)=2e3xf\left(x\right)=2e^{3x} .

a)

f′′′′(x)=e3x−1f''''\left(x\right)=e^{3x-1}

b)

f′′′′(x)=108e3xf''''\left(x\right)=108e^{3x}

c)

f′′′′(x)=162e3xf''''\left(x\right)=162e^{3x}

d)

f′′′′(x)=216e3x−1f''''\left(x\right)=216e^{3x-1}

10.

What is the value of d2ydx2\frac{\text{d}^2y}{\text{d}x^2} for, y=3x4−2x3y=3x^4-2x^3 if x=1x=1 ?

a)

d2ydx2=1\frac{d^2y}{\text{d}x^2}=1

b)

d2ydx2=6\frac{d^2y}{\text{d}x^2}=6

c)

d2ydx2=12\frac{d^2y}{\text{d}x^2}=12

d)

d2ydx2=24\frac{d^2y}{\text{d}x^2}=24