JEE Main 201226 MayOnline
- Exam
- JEE Main
- Year
- 2012
- Date
- 26 May
- Mode
- Online
- Subject
- Mathematics
- Chapter
- Area Under Curves
JEE Main 2012 · 26 May · Online · Mathematics · Area Under Curves
The area bounded by the parabola y^2=4 x and the line 2 x-3 y+4=0 ,...
The area bounded by the parabola and the line , in square unit, is
Options
- A
- B
- C1
- D
Correct answer
B.
Step-by-step solution
Intersecting points are
\begin{aligned}
& \therefore \text { Required area }=\int_1^4\left[2 \sqrt{x}-\left(\frac{2 x+4}{3}\right)\right] d x \\
& =\left.\frac{2 x^{3 / 2}}{3 / 2}\right|_1 ^4-\left.\frac{2 x^2}{3 \times 2}\right|_1 ^4-\left.\frac{4}{3} x\right|_1 ^4
\end{aligned}\begin{aligned}
& =\frac{4}{3}\left(4^{3 / 2}-1^{3 / 2}\right)-\frac{1}{3}(16-1)\left[\frac{4}{3}(4)-\frac{4}{3}\right] \\
& =\frac{4}{3}(7)-5-4=\frac{28}{3}-9=\frac{28-27}{3}=\frac{1}{3}
\end{aligned}