We have to find the area of the region A=(x,y):2y2≤x≤y+4
Now, to find the point of intersection of the curves x=2y2 and x=y+4, we equate the value of x, to get
2y2=y+4
⇒y2=2y+8
⇒y2−2y−8=0
⇒(y−4)(y+2)=0
⇒y=4 or y=−2
And, the graph of the given functions is as

The shaded area is the required area, and
Area=∫−24(xline−xparabola)dy
=∫−24(y+4−2y2)dy
Now, using ∫xndx=n+1xn+1, we get
Area=(2y2+4y−6y3)∣−24
=(8+16−332)−(2−8+34)
=18 sq units.