Use the laplace transform to solve the initial value problem"3y +2y=0, y(0)=1, y(0)=0.

Y(s) = 2/(s+2) - 1/(s+1)

y(t) = 2e^(-2t) - e^(-t)

Step-by-step explanation:

Let's solve y'' + 3y' + 2y = 0, by the Laplace transform.

So, the first step is to find the Laplace transform of each component of the differential equation

L{y''(t)} = s^2Y(s) - sy(0) - y'(0) = (s^2)Y(s) - s

L{3y'(t)} = 3L{y'(t)} = 3(sY(s) - y(0)) = 3sY(s)

L{2y(t)} = 2L{y(t)} = 2Y(s)

So now we have to solve the following equation:

(s^2)Y(s) - s + 3sY(s) + 2Y(s) = 0

Y(s)(s^2 + 3s + 2) = s

Y(s)(s+2)(s+1) = s

Y(s) = (s/(s+2)(s+1))

Now to find y(t) and solve the initial value problem, we need to do the inverse Laplace transform of Y(s), that we can do the following way:

Y(s) = (s/(s+2)(s+1)) = (A/(s+2)) + (B/(s+1))

where A = s/(s+1) when s = -2, so A = 2

B = s/(s+2) when s = -1, so B = -1

So

Y(s) = 2/(s+2) - 1/(s+1)

Doing the inverse Laplace transform

y(t) = 2e^(-2t) - e^(-t)

answer:     true

step-by-step explanation:

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b