Mathematics: The solution of a certain differential equation is of the form y(t)=aexp(7t)+bexp(11t), where a and b are constants. the solution has initial conditions y(0)=1 and y′(0)=4. find the solution by using the initial conditions to get linear equations for a and b.

A B CThe whole segment is AC,AC=7,BC=5. AB=? AC-BC=AB 7-5=2...

The solution of a certain differential equation

juiceyj9811

02.01.2022

Step-by-step explanation:

Given that the solution of a certain differential equation is of the form

$y(t) = ae^{7t} +be^{11t}$

Use the initial conditions

i) y(0) =1

$1=a(1)+b(1)\\a+b=1$ ... I

ii) y'(0) = 4

Find derivative of y first and then substitute

$y'(t) = 7ae^{7t} +11be^{11t}\\y'(0) =7a+11b \\7a+11b =4 ...II$

Now using I and II we solve for a and b

Substitute b = 1-a in II

$7a+11(1-a) = 4\\-4a+11 =4\\-4a =-7\\a = 1.75 \\b = -0.75$

Hence solution is

$y(t) = 1.75e^{7t} -0.75e^{11t}$

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