Question Details

The area bounded by the line y = 2x – 2, y = -x and x-axis is given by

Options

A

9/2 sq. units

B

43/6 sq. units

C

35/6 sq. units

D

None of these

Correct Answer :

None of these

Solution :

The correct option is None of these.

To find the area bounded by the lines y=2x2, y=x, and the x-axis (y=0), we first find the intersection points of these boundary lines.

Step 1: Find the intersection of the two lines
Set the equations equal to each other to find the x-coordinate:
2 x 2 = x
Add x to both sides and add 2 to both sides:
3 x = 2 x = 2 3
Now substitute x=23 back into y=x:
y = 2 3
Thus, the point of intersection is:
C 2 3 , 2 3

Step 2: Find the intersections with the x-axis (where y=0)
For the line y=x:
x = 0 x = 0
This gives the intersection point A0,0.
For the line y=2x2:
2 x 2 = 0 x =1
This gives the intersection point B1,0.

Step 3: Calculate the area of the bounded triangular region
The region forms a triangle with vertices at A0,0, B1,0, and C23,23.
Since A and B both lie on the x-axis, the base of the triangle lies along the x-axis:
Base = 1 0 = 1 unit
The height of the triangle is the perpendicular distance from vertex C to the x-axis, which is the absolute value of its y-coordinate:
Height = 2 3 = 2 3 units
Using the formula for the area of a triangle:
Area = 1 2 × Base × Height
Area = 1 2 × 1 × 2 3 = 1 3 sq. units

Since the area is 13 sq. units, which does not match any of the given choices ("9/2 sq. units", "43/6 sq. units", or "35/6 sq. units"), the correct answer is indeed None of these.

Unlock Our Free Library

Access expert-curated educational resources and study materials—completely free.

Discover more resources

You may also like

Mock Tests

View All
  • JEE
  • intermediate
  • 3 hours
  • chemistry, mathematics, physics

  • JEE
  • intermediate
  • 3 hours
  • chemical engineering, mathematics, physics