a = -2
b = 1 - (-2) = 1 + 2 = 3, 4 - 1 = 3,
Sn = n/2(2a + (n - 1)b)
S10 = 10/2(2(-2) + (10 - 1)3)
S10 = 5(-4 + 27)
S10 = 5(23)
S10 = 115.
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Verified answer
a = -2
b = 1 - (-2) = 1 + 2 = 3, 4 - 1 = 3,
Sn = n/2(2a + (n - 1)b)
S10 = 10/2(2(-2) + (10 - 1)3)
S10 = 5(-4 + 27)
S10 = 5(23)
S10 = 115.