   Chapter 17.1, Problem 6E

Chapter
Section
Textbook Problem

Solve the differential equation.6. 9y" + 4y = 0

To determine

To solve: The differential equation of 9y+4y=0 .

Explanation

Formula used:

Write the expression for differential equation.

ay+by+cy=0 (1)

Write the expression for auxiliary equation.

ar2+br+c=0 (2)

Write the expression for the complex roots.

r=α±iβ (3)

Write the expression for general solution of ay+by+cy=0 with complex roots.

y=eαx(c1cosβx+c2sinβx) (4)

Here,

α is the real part of the root, and

β is the imaginary part of the root.

Consider the differential equation as follows.

9y+4y=0 (5)

Compare equation (1) and equation (5).

a=9b=0c=4

Find the auxiliary equation.

Substitute 9 for a , 0 for b and 4 for c in equation (2),

(9)r2+(0)r+(4)=09r2+4=0

Re-write equation as follows.

9r2=4r2=49r=±49ir=±23i

Write the expression of r in terms of α and β

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