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Verified answer
Mapel : MatematikaKelas : IX SMP
Bab : Barisan dan deret
Pembahasan :
Beda = (U5 - U2)/(5 - 2)
Beda = (34 - 46)/3
Beda = -12/3
Beda = -4
U2 = 46
a + b = 46
a = 50
Maka...
Un = a + (n - 1)b
U11 = 50 + 10.(-4)
U11 = 50 - 40
U11 = 10 —» Suku ke-11
Verified answer
U2 = 46a + b = 46
a = 46 - b ... (1)
U5 = 34
a + 4b = 34 ...(2)
»Substitusi (1) ke (2)
46 - b + 4b = 34
3b = -12
b = -4
»Substitusi b = -4 ke (1)
a = 46 - (-4)
a = 50
Maka
Un = 50 + (n - 1)-4
U11 = 50 + 10(-4)
U11 = 50 - 40
U11 = 10