Question Details

Area bounded by the lines y = |x| – 2 and y = 1 – | x – 1 | is equal to

Options

A

4 sq. units

B

6 sq. units

C

2 sq. units

D

8 sq. units

Correct Answer :

4 sq. units

Solution :

The correct option is 4 sq. units.

To find the area bounded by the two curves, we first analyze their equations:
1. y=|x|-2
2. y=1-|x-1|

Let us analyze the shape and vertices of both functions:
- The first curve, y=|x|-2, is a V-shaped curve with its vertex at (0,-2) that opens upwards.
- The second curve, y=1-|x-1|, is an inverted V-shaped curve with its vertex at (1,1) that opens downwards.

Now, we find the points of intersection of the two curves by analyzing them in different intervals:
Case 1: x<0
Here, |x|=-x and |x-1|=1-x.
The equations become:
y=-x-2
y=1-(1-x)=x
Equating them: -x-2=x2x=-2x=-1.
Thus, one intersection point is (-1,-1).

Case 2: x>1
Here, |x|=x and |x-1|=x-1.
The equations become:
y=x-2
y=1-(x-1)=2-x
Equating them: x-2=2-x2x=4x=2.
Thus, the other intersection point is (2,0).

The bounded region is a quadrilateral with vertices at the intersection points and the vertices of the two V-graphs:
- Vertex A(-1,-1)
- Vertex B(0,-2)
- Vertex C(2,0)
- Vertex D(1,1)

We can calculate the area of this quadrilateral ABCD by dividing it into two triangles along the diagonal AC or by using the coordinates formula for the area of a polygon:
Area=12|xA(yB-yD)+xB(yC-yA)+xC(yD-yB)+xD(yA-yC)|
Let's compute the area using the formula:
Area=12|(-1)(-2-1)+0(0-(-1))+2(1-(-2))+1(-1-0)|
Area=12|(-1)(-3)+0+2(3)+1(-1)|
Area=12|3+0+6-1|
Area=12|8|=4 sq. units

Therefore, the area bounded by the lines is indeed 4 sq. units.

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