alleryIf $f(x)=x^2+3x$, then $f'(x)$ equals:
A$2x$
B$2x+3x$
C$2x+3$
D$x+3$
Answer & Solution
Correct answer: C. $2x+3$
Differentiate term by term: d/dx(x²+3x) = 2x + 3.
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