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Mathematics · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 1 · Q28
Find: ∫ (3 x+5)/(√(x^2+2 x+4)) d x
Find : $\displaystyle \int \frac{3 x+5}{\sqrt{x^{2}+2 x+4}} \mathrm{~d} x$
Marking-scheme solution
$$\begin{aligned}
& I=\int \frac{3 x+5}{\sqrt{x^{2}+2 x+4}} d x=\frac{3}{2} \int \frac{2 x+2}{\sqrt{x^{2}+2 x+4}} d x+2 \int \frac{1}{\sqrt{x^{2}+2 x+4}} d x \\
& I=\frac{3}{2}\left(2 \sqrt{x^{2}+2 x+4}\right)+2 \int \frac{1}{\sqrt{(x+1)^{2}+\sqrt{3}^{2}}} d x \\
& I=3 \sqrt{x^{2}+2 x+4}+2 \log \left|(x+1)+\sqrt{x^{2}+2 x+4}\right|+c
\end{aligned}
$$
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CBSE Class 12 Mathematics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.