Question

Show that nsquare -1is divisible by 8 if n is a odd positive integer

Answer 1

${n}^{2} - 1 = {9}^{2} - 1 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: = \: 80 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{80}{8} = 10$
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