A hint to get started
Split three horizontal area pieces
Find the area of the region bounded by , the y-axis, and the lines and .
CJC · Lecture · Example 11
Both copies already contain the three shaded pieces, labelled x/y bounds, rearrangement callout, complete signed-integral setup and 9⅓ final answer. These were compared rather than attributed as Teacher-only additions.
Use the y-axis crossings to split the interval before evaluating. The explicit antiderivative and intermediate numerical contributions here are independently authored.