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Verified answer
Un=a+(n-1)bU15=48+(14)(-4)
=48-56
=-8
Verified answer
Materi : Barisan dan DeretDiketahui :
⇒ a = 48
⇒ b = -4
Ditanya : Nilai dari suku ke 15 ( U15 ) ... ?
Pembahasan :
Un = a + ( n - 1 ) b
U₁₅ = 48 + ( 15 - 1 ) (-4)
U₁₅ = 48 + 14 (-4)
U₁₅ = 48 - 56
U₁₅ = -8
Semoga membantu ... semangat ^_^