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a. p = 1, q = 2, r = -3
1² + 2.(2).(-3) + 3.(2) = 1 - 12 + 6
= -3
b. p = -2, q = 3, r = 1
(-2)² + 2.(3).(1) + 3.(3) = 4 + 6 + 9
= 19
c. p = 1, q = 5, r = -2
1² + 2.(5).(-2) + 3.(5) = 1 - 20 + 15
= -4
d. p = 3, q = 2, r = -5
3² + 2.(2).(-5) + 2.(2) = 9 - 20 + 4
= -7