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a. Un = 4 + 2n - 3n²
U₁ = 4 + 2(1) - 3(1)² = 4 + 2 - 3 = 3
U₂ = 4 + 2(2) - 3(2)² = 4 + 4 - 12 = -4
b = -4 - 3
b = -7
U₃ = 3 + 2(-7) = 3 - 14 = -11
U₄ = 3 + 3(-7) = 3 - 21 = -18
U₅ = 3 + 4(-7) = 3 - 28 = -25
b. Un = (-2)ⁿ
U₁ = -2
U₂ = -2² = 4
U₃ = -2³ = -8
U₄ = -2⁴ = 16
U₅ = -2⁵ = -32
yang lain kerjakan sendiri, biar bisa matematika
a) -1,-3,-5,-7,-9,-11,-13
Un=a+(n-1)b
=-1+(n-1)b
=-1-2n+2
=1-2n
b)1,3,9,27,81,243,729
Un=ar^n-1
=1.3^n-1
=3^n-1
silahkan dikoreksi kembali ya