Consider the following piecewise function: f(x) = Xcos, x<0 0sx<4 a. Use the first principles definition of a derivative to determine f'(x) when 0≤x<4 b. Determine /"(3) c. Determine the equation of the tangent to f(x) when x = - d. Determine f'(x) when x>4 e. Is f(x) continuous when x = 4? Use the formal definition of continuity to argue your answer.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Please help me with this. Please check if I've gotten the write answer for each questions. And if I have shown the correct steps. Just check question d) and e)

Just write the answers that are correct (e.g. a) correct, b) incorrect )

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i XZ4
Differentiate with respect to 'x'
f'(x) = (x² + 3) dx (√x) - √x dx (x² + 3)
(x²+3) ²
UX
d) f(x) = x²+3
1
X-74+
2√x (x² + 3) = 2x √x
(x² + 3)²
Therefore
2
x² + 3-4x²
2√x (x²+3) ²
-3-3x²
Therefore when x 74
f'(x) = 3-3x
2√x (x²+3) ²
(+),
e) ((4) = (4) ² +3 = 1613 = 2
lim f(x)
X-74
lim
X-74
2
= 2√x (x²+3) ²
2
4+15
lim
X-74+
fin =
++
16+3
(x+15)
2
19
X²+3
2
19
lim f(x) lim f(x) = f (4)
X-74
X-74+
(using Quotient Rule)
13121
Thus the function f(x) is continuous at x = 4
Transcribed Image Text:i XZ4 Differentiate with respect to 'x' f'(x) = (x² + 3) dx (√x) - √x dx (x² + 3) (x²+3) ² UX d) f(x) = x²+3 1 X-74+ 2√x (x² + 3) = 2x √x (x² + 3)² Therefore 2 x² + 3-4x² 2√x (x²+3) ² -3-3x² Therefore when x 74 f'(x) = 3-3x 2√x (x²+3) ² (+), e) ((4) = (4) ² +3 = 1613 = 2 lim f(x) X-74 lim X-74 2 = 2√x (x²+3) ² 2 4+15 lim X-74+ fin = ++ 16+3 (x+15) 2 19 X²+3 2 19 lim f(x) lim f(x) = f (4) X-74 X-74+ (using Quotient Rule) 13121 Thus the function f(x) is continuous at x = 4
Consider the following piecewise function: f(x) =
XCOLE x<0
0≤x≤4
a. Use the first principles definition of a derivative to determine f'(x) when 0 < x < 4
b. Determine f"(3)
c. Determine the equation of the tangent to f(x) when x = - =
d. Determine f'(x) when x > 4
e. Is f(x) continuous when x = 4? Use the formal definition of continuity to argue your answer...
Transcribed Image Text:Consider the following piecewise function: f(x) = XCOLE x<0 0≤x≤4 a. Use the first principles definition of a derivative to determine f'(x) when 0 < x < 4 b. Determine f"(3) c. Determine the equation of the tangent to f(x) when x = - = d. Determine f'(x) when x > 4 e. Is f(x) continuous when x = 4? Use the formal definition of continuity to argue your answer...
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