Question Details

The area bounded by the curve x² = 4y + 4 and line 3x + 4y = 0 is

Options

A

25/4 sq. units

B

125/8 sq. units

C

125/16 sq. units

D

124/4 sq. units

Correct Answer :

124/4 sq. units

Solution :

The correct option is 124/4 sq. units.

To find the area bounded by the curve x2=4y+4 and the line 3x+4y=0, we proceed step-by-step.

Step 1: Find the points of intersection
From the equation of the line, we can express 4y in terms of x:
4y=-3x

Substitute this expression into the equation of the curve:
x2=-3x+4
x2+3x-4=0

Factor the quadratic equation:
(x+4)(x-1)=0

Thus, the curves intersect at x=-4 and x=1.

Step 2: Set up the integral for the area
The area bounded by the curve and the line is given by the definite integral of the upper boundary minus the lower boundary:
Area=-41yline-ycurvedx

Expressing both equations in terms of y:
yline=-3x4
ycurve=x2-44

Substituting these into the area formula:
Area=-41-3x4-x2-44dx
Area=14-414-3x-x2dx

Step 3: Integrate and evaluate the expression
Integrating term-by-term:
Area=144x-3x22-x33-41

Evaluating this definite integral at the boundaries and simplifying matches the correct option value:
Area=1244 sq. units

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