Which rule is used to differentiate f(x) = u(x) · v(x)?
A
Sum Rule
B
Quotient Rule
C
Chain Rule
D
Product Rule
Analysis & Theory
The product rule is used when differentiating the product of two functions.
If f(x) = x² · sin x, what is f'(x)?
A
2x · sin x
B
x² · cos x
C
2x · sin x + x² · cos x
D
2x · cos x + x² · sin x
Analysis & Theory
Use product rule: d/dx(x²·sin x) = 2x·sin x + x²·cos x.
Differentiate f(x) = e^x · ln x
A
e^x · ln x + e^x/x
B
e^x + ln x
C
e^x · ln x
D
ln x / x
Analysis & Theory
d/dx(e^x · ln x) = e^x · ln x + e^x · (1/x).
What is d/dx of (x³ · cos x)?
A
3x² · cos x
B
x³ · sin x
C
3x² · cos x - x³ · sin x
D
None of the above
Analysis & Theory
Use product rule: d/dx(x³ · cos x) = 3x²·cos x - x³·sin x.
If f(x) = (x + 1)(x - 2), then f'(x) is:
A
1
B
2x - 1
C
2x + 1
D
None of these
Analysis & Theory
Using product rule or expand first: f(x) = x² - x, f'(x) = 2x - 1.
The derivative of f(x) = x · ln x is:
A
1/x
B
x/ln x
C
ln x + 1
D
ln x - 1
Analysis & Theory
Using product rule: d/dx(x·ln x) = 1·ln x + x·(1/x) = ln x + 1.
What is the derivative of f(x) = x · e^x?
A
x · e^x
B
e^x
C
e^x + x · e^x
D
x · e^x - e^x
Analysis & Theory
Using product rule: d/dx(x · e^x) = 1 · e^x + x · e^x = e^x + x · e^x.
d/dx(x² · ln x) equals:
A
2x · ln x
B
x² / x
C
2x · ln x + x
D
2x · ln x + x
Analysis & Theory
Product rule: d/dx(x² · ln x) = 2x · ln x + x.
Differentiate f(x) = (2x)(3x² + 1)
A
6x² + 2
B
6x² + 6x
C
12x² + 2
D
12x² + 6x
Analysis & Theory
Product rule: f'(x) = 2 · (3x² + 1) + 2x · 6x = 6x² + 2 + 12x² = 12x² + 6x.
What is d/dx of (x³ · log x)?
A
3x² log x + x²
B
x³ / x + log x
C
3x² log x + x²
D
3x² / x + x
Analysis & Theory
Product rule: d/dx(x³ · log x) = 3x² · log x + x³ · (1/x) = 3x² log x + x².