3. If p = -2, q = -1 and r = 3, find the value of
(i) p2+ q2 – r2
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Answer:
p= -2,q = -1,r=3
p^2+q^2-r^2
=(-2)^2+(-1)^2-(3)^2
=4+1-9
=5-9
= -4
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