If n(n + 1) = 420, then n = ?
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the value of n is 20
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n(n+1)=420
n^2 + n = 420
n^2 + n - 420 = 0
n^2 + 21n - 20n - 420 =0
n(n + 21) - 20 (n + 21) =0
(n+21) (n-20)=0
n= -21 or 20
n^2 + n = 420
n^2 + n - 420 = 0
n^2 + 21n - 20n - 420 =0
n(n + 21) - 20 (n + 21) =0
(n+21) (n-20)=0
n= -21 or 20
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