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If Un n n2 1 evaluate U5 - U4 - WAEC Mathematics 2013 Question

If Un = n(n2 + 1), evaluate U5 - U4
A
18
B
56
C
62
D
80
correct option: c
Un = n(n2 + 1)

U5 = 5(2 + 1)

= 5(25 + 1)

= 5(26) = 130

U4 = 4(42 + 1) = 4(16 + 1)

= 4(17) = 68

U5 - U4 = 130 - 68

= 62
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