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First, add 10 to both sides in order to make the equation equal to 0.
N^2 - n -10 + 10 = -10 + 10. The -10 and +10 on both sides actually cancel out to make 0.
N^2 - n = 0. Next, simplify the equation by factoring out an 'n' from both terms.
n(n-1) = 0. N^2 is basically n x n, so factoring out 1 n would leave 1 remaining. - n is like -1 x n, so factoring
out n there leaves only -1.
For the equation to equal 0, N must be 0 or 1. (Because 0 times anything is 0, and 1-1 = 0)
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