Use the identity (x+a) (x+b)=x²+ (a+b) x+ab to find the following products
1. (p+10) (p+11)
2. (4x+9) (4 x+12)
3.(x-5) ( x-2)
4.(9x-5) (9x-1)
5.(2x+5y) ( 2x+3y)
6.(2a²+9) (2a²+5)
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