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Worksheets

EEE -Differential Equations types

Total questions: 15

Worksheet time: 10mins

Name
Class
Date
1.

Given the differential equation dP/Dt=5P

A) Find the general solution for P to the differential equation

B)Find the particular solution for P to the differential equation given P(0)= 418

a)

A) P=Ce5t

B) P= 5e418t

b)

A) P=Ce5t

B) P= 418e5t

c)

A) P=Cet

B) P= 418et

d)

A) P=Ce10t

B) P= 418e10t

2.

Solve the following differential equations:
 dydx=ex\frac{\text{d}y}{\text{d}x}=e^x  

a)

 1=ex+C1=e^x+C  

b)

 y=ex2+Cy=\frac{e^x}{2}+C  

c)

 y=ex+Cy=e^x+C  

d)

 0=ex+C0=e^x+C  

3.

Of the following, which is a solution to the differential equation, select all that apply:
 y6y+8y=0y''-6y'+8y=0  

a)

 y=2sin(4x)y=2\sin\left(4x\right)  

b)

 y=3e2xy=3e^{2x}  

c)

 y=Ce4x, y=Ce^{4x},\   where C is a constant

4.

The solution of linear differential equation  xdydx+2y=x2x\frac{\text{d}y}{\text{d}x}+2y=x^2  

a)

 y=x2+c4x2y=\frac{x^2+c}{4x^2}  

b)

 y=x24+cy=\frac{x^2}{4}+c  

c)

 y=x4+cx2y=\frac{x^4+c}{x^2}  

d)

 y=x4+c4x2y=\frac{x^4+c}{4x^2}  

5.

Solve the following differential equations:
 dydx=3y\frac{\text{d}y}{\text{d}x}=3y  

a)

 y=Ce3xy=Ce^{3x}  

b)

 y=3x+Cy=3x+C  

c)

 y22=3x+C\frac{y^2}{2}=3x+C  

d)

 lny=x+C\ln y=x+C  

6.
What is the order and degree of the differential equation?
a)
1, 2
b)
2, 1
c)
3, 2
d)
2, 3
7.

What is the order of a differential equation?

a)

the highest power of y

b)

The highest power of x

c)

the highest order of the derivative

d)

the coefficient of y

8.

Example of homogenous equation

a)

m²+2m+3

b)

m²+3m+2

c)

(m²+5m+6)y=0

d)

m²+5m+6=5

9.

Identify the roots of the equation m²-8m+16=0 is

a)

Real and distinct

b)

imaginary

c)

real and equal

d)

no roots

10.

If the roots are imaginary the complementary function is

a)

Y=Aeᵐ1ˣ+Beᵐ2ˣ

b)

Y=eᵅˣ(Acosβx +Bsinβx)

c)

.Y=(Ax+B)eᵐˣ

d)

None of the above

11.

The auxiliary equation of (D²+5D+6)y=0 is

a)

a.m²+2m+3

b)

m²+3m+2

c)

(m²+5m+6)y=0

d)

m²+5m+6=0

12.

Find the roots of the auxiliary equation m³-6m²+11m-6=0

a)

1 2 3

b)

2 3

c)

4 2

d)

0 2 3

13.

In the general equation (a d²/dx² + b d/dx + c)y =V , d²/dx² denotes

a)

D

b)

c)

m

d)

14.

Find the particular integral (D²+8D+16)y=e⁻²ˣ

a)

(Ax+B)e⁻²ˣ+e⁻⁴ˣ/4

b)

(Ax+B)e⁻⁴ˣ+e⁻ˣ/2

c)

(Ax+B)+e⁻⁴ˣ+e⁻²ˣ/4

d)

(Ax+B)e⁻⁴ˣ+e⁻²ˣ/4

15.

Solve (D²-5D+6)y=3e⁵ˣ

a)

Y=Ae²ˣ+Be³ˣ+e⁵ˣ/6

b)

Y=Ae⁻²ˣ+Be⁻³ˣ+e⁵ˣ/2

c)

Y=Ae²ˣ+Be³ˣ+e⁵ˣ/2

d)

Y=(Ax+B)e²ˣ+e¹⁵ˣ/2