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Answer:
u₂ = 5
u₃ = 53
u₄ = 5621
Step-by-step explanation:
u₁ = 1
uₙ₊₁ = 2(uₙ)² + 3
u₂ = u₁₊₁ = 2ₓu₁² + 3 = 2*1² + 3 = 5
u₃ = u₂₊₁ = 2*u₂² + 3 = 2*5² + 3 = 53
u₄ = 2*u₃² + 3 = 2*53² + 3 = 5621