k = -1, p = 2
k = -1, p = -2
k = 1, p = -2
k = 1, p = 2
Correct answer is C
Un = kn2 + pn,
U1 = -1,
U5 = 15,
when n = 1
U1 = k(1)2+ p(1) = -1
k + p = -1 --------eqn1
when n = 5
U5 = k(5)2+ p(5) = 15
25k + 5p = 15 --------eqn2
multiply eqn1 by 5 and eqn2 by 1
5k + 5p = -5 -------eqn3
25k + 5p = 15 -------eqn4
eqn4 - eqn3
20k = 20
k = 1
sub for k in eqn1
1 + p = -1
p = -1 -1 = -2
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