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n² + n - 15 252=0
a=1
b=1
c=- 15 252
Δ=b²-4ac
Δ=1-4*1*(- 15 2520
Δ=61 009
√Δ=247
n₁=(-b+√Δ ): 2a
n₁=(-1+247) : 2
n₁=246:2
n₁=123
n₂=(-b-√Δ):2a
n₂=(-1-247):2
n₂=-248:2
n₂=-124