Find d/dx of the square root of x, for x > 0.
A1/sqrt(x)
B1/(2 sqrt(x))
C2 sqrt(x)
D-1/(2 sqrt(x))
Answer & Solution
Correct answer: B. 1/(2 sqrt(x))
Write sqrt(x) as x^(1/2); the power rule gives (1/2) x^(-1/2) = 1/(2 sqrt(x)).
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