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Verified answer
1^2 - 2^2 + 3^2 - 4^2 + 5^2 -6^2 + 7^2 +...+99^21 + 5 + 9 + 13 + 17 +...... +197
a=1
b=4
Un=a+(n-1)b
197=1+(n-1)4
197=1+4n-4
197+4-1=4n
200 = 4n
50 = n
Sn=50/2(2(1) + (50-1) 4)
Sn=25 (2 + 196)
Sn=25 (198)
Sn= 4.950
Verified answer
Materi Baret= 1^2 + (-2^2 + 3^2) + (-4^2 + 5^2) + .... + (-98^2 + 99^2)
= 1 + 5 + 9 + ... + 197
Diperoleh
a = 1, b = 4, n = 50
Jadi,
S50 = 50/2(1 + 197) = 25 × 198 = 4950