I. ` 2p^(2) + 20p+50 = 0`
II. ` q^(2) = 25`

I. p^(2) + 12p+35 = 0 II. 2q^(2) + 22q+56 = 0

I. p^(2) - 8p+15 = 0 II. q^(2) - 5q =- 6

I. 3p^(2) + 17p+10 = 0 II. 10q^(2) +9q+2=0

I. 3p^(2)+10p+8 = 0 II. 2q^(2) + 3q+1 = 0

I. p^(2) + p = 56 II. q^(2) - 17q+ 72 = 0

I. p^(2)+5p+6 = 0 II. q^(2) + 3q + 2 = 0

I. p^(2) - 7p=- 12 II. q^(2) - 3q+2=0

I. 3p+2q - 58 = 0 II. 4q+4p= 92

p @ q = p^2 - 20 if p > q , q 2 q = p^2 + 20 if p le q, then for a = 5 and b = 4 the value of [(a @ b) @ (a @ b)] - [(b @ a) @ (b @ a)] is :