- #1
curlybit89
- 2
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Hello! I took an exam awhile back and missed two questions but have no feedback describing what went wrong. Let me know what you think.
Derivative of x / 1 - x
Second derivative of -1/3x
2. The attempt at a solution
My answer for 1 was the number -
(1)(1-x) - (x)(-1) / (1-x)^2
1-x / (1-x)^2 - Cancel leaving x/1-x
x / -x = -1
-1 / 1 = -1
---
Second problem:
f''(x) -1/3x
-1/3x = -3x^-1
f'(x) = (-1)(-3x)^-2 = 1/3x^2
f''(x) = (-2)(3x)^-3 = 1/-6x^3
These two problems are incorrect, I'm not sure why.
Homework Statement
Derivative of x / 1 - x
Second derivative of -1/3x
2. The attempt at a solution
My answer for 1 was the number -
(1)(1-x) - (x)(-1) / (1-x)^2
1-x / (1-x)^2 - Cancel leaving x/1-x
x / -x = -1
-1 / 1 = -1
---
Second problem:
f''(x) -1/3x
-1/3x = -3x^-1
f'(x) = (-1)(-3x)^-2 = 1/3x^2
f''(x) = (-2)(3x)^-3 = 1/-6x^3
These two problems are incorrect, I'm not sure why.