Concept:Area between two curves is found by integrating the upper curve minus the lower curve over the given limits.Explanation:The curve y=x2+3 lies above the line y=x in the interval x∈[0,3].The region is bounded by the y-axis at x=0 and the vertical line x=3.So, the required area is:Area=∫03[(x2+3)−x]dx=∫03(x2−x+3)dx=[3x3−2x2+3x]03=(9−29+9)−0=18−29=227 sq. units