If the demand fun
tion is
P = Q
2 − 7Q − 8,
where P and Q are the pri
e and quantity respe
tively, determine the point pri
e elasti
ity of demand
(rounded to three de
imal pla
es) if P = 51. Is demand elasti
or inelasti
at this pri
e?
[1℄ ed = −0.075; inelasti
[2℄ ed = −0.530; elasti
[3℄ ed = 1.300; elasti
[4℄ ed = −0.255; inelasti
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