=6a^2-8b^2-3ab-7a

2. Polynomial = (n-2) x 2+(m-5) x- 1

So n-2=0 and m-5=0.

The solution is n=2 and n=5.

3, according to the given program

1* 1=2

(1+1) *1= 2+1,which means 2* 1=3.

2*( 1+ 1)=3-2, which means 2*3= 1.

(2+1) * 3 =1+1means 3*3=2.

3*(3+ 1)=2-2, which means 3*4=0.

(3+ 1)*4=0+ 1, which means 4*4= 1.

4*(4+ 1)= 1-2, which means 4*5=- 1.

(4+1) * 5 =-1+1means 5*5=0.

5*(5+ 1)=0-2, which means 5*6=-2.

(5+ 1)*6=-2+ 1, which means 6*6=- 1.