Let f be a differentiable function such that f'(x)=7-3/4*(f(x))/(x), (x>0) and f(1)ne 4. Then lim_(xrightarrow 0^+)x*f(1/x): A)does not exist. B)exists and equals 4. C)exists and equals 4/7. D)exists and equals 0.

rehaucesnwr1

rehaucesnwr1

Answered question

2023-02-23

Let f be a differentiable function such that f ( x ) = 7 3 4 f ( x ) x , ( x > 0 ) and f ( 1 ) 4 . Then lim x 0 + x f ( 1 x ) :
A)does not exist.
B)exists and equals 4.
C)exists and equals 4/7.
D)exists and equals 0.

Answer & Explanation

Ruby Rollins

Ruby Rollins

Beginner2023-02-24Added 5 answers

The right decision is A exists and equals 4.
f ( x ) = 7 3 4 f ( x ) x ...(1)
Let y = f ( x )         f ( x ) = d y d x
d y d x = 7 3 y 4 x
d y d x + 3 y 4 x = 7
An example of a linear differential equation is the one above
I . F . = e 3 4 x d x = x 3 4
y x 3 4 = 7 x 3 4 d x
y x 3 4 = 4 x 7 4 + c
f ( x ) = 4 x + c x 3 4
Now, lim x 0 + x f ( 1 x ) = lim x 0 + x ( 4 x + c x 3 4 ) = 4

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