- #1
foo9008
- 678
- 4
Homework Statement
For region 8<x<12 , why there's an extra (60-30y +3.75y^2 ) - (30y-7.5y^2) ?
How to get that? I have no idea at all...
Homework Equations
The Attempt at a Solution
here's my working, i have divided the triangle into three parts, i gt 129-80 -75- (60-30y=3.75y^2) - (30y-7.5y^2)-(3.75y^2) instead of 129-80 -75- (60-30y=3.75y^2) - (30y-7.5y^2)
Is the author wrong?