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a : x+1
U2 : 2x-1
U3 : 3x-3
Q :
S11-S3
Answer :
• Cari b
b = U2-a
b = 2x-1-(x+1)
b = 2x-1-x-1
b = x-2
• Cari S3
S3 : x+1+2x-1+3x-3
S3 : 6x-3
• Cari S11
S11 : 11/2 {2.(x+1) + (11-1)(x-2)}
S11 : 6,5 {2x+2+10x-20}
S11 : 6,5 {12x-18}
S11 : 78x-117
• Kurangkan S11 dan S3
78x-117-(6x-3)
78x-117-6x+3
72x-114
Final Answer : 72x-114
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