(b) : We have, x2 ≤ y, 8 − x2 ≥ y, y ≤ 7
Converting the given inequations into equations, We get x2 = y and y = 8 − x2 Solving these equations to find their point of intersection i.e., x2 = 8 − x2 ⇒ 2x2 = 8 ⇒ x2 = 4 ⇒ x = ± 2 ∴ y = 4 Required area = ∫−22 ( 8 − x2 − x2 ) dx − ∫−11 ( 8 − x2 − 7 ) dx = ∫−22 ( 8 − 2x2 ) dx − ∫−11 ( 1 − x2 ) dx = [ 8x − 32x3 ]−22 − [ x − 3x3 ]−11 = [ ( 16 − 316 ) − ( −16 + 316 ) ] − [ 32 + 32 ] = 16 − 316 + 16 − 316 − 34 = 20 sq. units