Find the area of the region bounded by the line y=2x+3y = 2x + 3, the x-axis, and the ordinates x=0x = 0 and x=2x = 2.

Model Answer & Options

Source: Extra Practice

10 sq units

6 sq units

14 sq units

8 sq units

Explanation

The area is given by the integral 02(2x+3)dx\int_{0}^{2} (2x + 3) dx. Integrating term by term: 2xdx=x2\int 2x dx = x^2 and 3dx=3x\int 3 dx = 3x. Thus, we have [x2+3x]02[x^2 + 3x]_{0}^{2}. Substituting the upper limit x=2x=2: 22+3(2)=4+6=102^2 + 3(2) = 4 + 6 = 10. Substituting the lower limit x=0x=0: 02+3(0)=00^2 + 3(0) = 0. The area is 100=1010 - 0 = 10 sq units. Geometrically, this is a trapezoid with height 2 and parallel sides of lengths 3 and 7 (Area=12(3+7)×2=10Area = \frac{1}{2}(3+7) \times 2 = 10). Options 2, 3, and 4 are results of common arithmetic mistakes in integration or substitution.

Try a Related Quiz

Test your skills on a similar concept: Units and Measurement - NCERT Class 11 Practice Set 1.

Start Related Quiz