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S5 = 3(5)^2 + 5
= 80
S1 = 3.1² + 5.1 = 8 = a
S2 = 3.2² + 5.2 = 22
S2 = U1 + U2
22 = 8 + U2
U2 = 22 - 8 = 14
U2 = a + b
14 = 8 + b
b = 14 - 8 = 6
U5 = a + 4b
= 8 + 4.6
= 8 + 24
= 32