Math questions?? I need help please!!

Math questions?? I need help please!!

The curve C, shown above, has equation y = 3x – x2. It passes through the origin O and 
the point B on the x-axis. 
(a) Find, in the form ax + by + c = 0, an equation of the normal to C at the 
point A(1, 2). 

(b) Show that this normal passes through the point B. 
The shaded region R is bounded by the curve and the line AB. 
(c) Find, by integration, the area of R. 

Continuing from answer is 4/3. They got that by integrating from 3 to 1 and then minus only the right angle triangle. 

why don t I get the same answer?

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