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igor_vitrenko [27]
3 years ago
8

If y = e2x is a solution to y''- 5y' + ky = 0, what is the value of k?

Mathematics
1 answer:
Nutka1998 [239]3 years ago
7 0

Answer:

The value of k is 6

Step-by-step explanation:

we need to find the value of k

Given : - y=e^{2x} is the solution y''-5y'+ky=0

y=e^{2x}                               ........(1)                  

differentiate  y=e^{2x} with respect to 'x'

\frac{dy}{dx}=\frac{d}{dx}e^{2x}

Since, \frac{d}{dx}e^{x} =e^{x}\frac{d}{dx}(x)

\frac{dy}{dx}=e^{2x}\frac{d}{dx}(2x)

\frac{dy}{dx}=e^{2x}\times 2

\frac{dy}{dx}=2e^{2x}

so, y'=2e^{2x}                     ..........(2)

Again differentiation above with respect to 'x'

\frac{d}{dx}\frac{dy}{dx}=\frac{d}{dx}2e^{2x}

\frac{d^{2}y}{dx^{2}}=2e^{2x}\frac{d}{dx}(2x)

\frac{d^{2}y}{dx^{2}}=2e^{2x}\times 2

\frac{d^{2}y}{dx^{2}}=4e^{2x}

so, y''=4e^{2x}                         ........(3)

Now, put the value of y\ ,y' \ \text{and} \ y'' in y''-5y'+ky=0

4e^{2x}-5(2e^{2x})+(e^{2x})k=0

4e^{2x}-10e^{2x}+e^{2x}k=0

-6e^{2x}+e^{2x}k=0

add both the sides by 6e^{2x}

e^{2x}k=6e^{2x}

Cancel out the same terms from left and right sides

k=6

Hence, the value of k is 6

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a + b = 8

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multiply the top equation by 4 and then subtract the bottom one from the top

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