Find the area bounded by the curves y = 4 – x2 and y = 2x + 1
-
A.
20(1/3) sq. units -
B.
20(2/3) sq. units -
C.
10(2/3) sq. units -
D.
10(1/3) sq. units
Correct Answer: Option D
Explanation
Hint:
y = 4 – x2 and y = 2x + 1
=> 4 – x2 = 2x + 1
=> x2 + 2x – 3 = 0
(x+3)(x-1) = 0
thus x = -3 or x = 1.
Integrating x2 + 2x – 3 from (-3, to 1) w.r.t x will give 31/3 = 10(1/3)