Tính đạo hàm của hàm số (y = \frac{{2x - 3}}{{x + 4}}\)
A. \(y' = \frac{{10}}{{{{(x + 4)}^2}}}\)
B. \(y' = \frac{{11}}{{{{(x + 4)}^2}}}\)
C. \(y' = \frac{5}{{{{(x + 4)}^2}}}\)
D. \(y' = \frac{{ - 11}}{{{{(x + 4)}^2}}}\)
Ta có:
\(\begin{array}{l}
y' = \frac{{{{\left( {2x - 3} \right)}^\prime }\left( {x + 4} \right) - \left( {2x - 3} \right){{\left( {x + 4} \right)}^\prime }}}{{{{(x + 4)}^2}}}\\
= \frac{{2\left( {x + 4} \right) - \left( {2x - 3} \right)}}{{{{\left( {x + 4} \right)}^2}}} = \frac{{11}}{{{{\left( {x + 4} \right)}^2}}}
\end{array}\)
Chọn B.
-- Mod Toán 11
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