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Is spinach easy to grow?

Spinach Botanical Name : Spinacia oleracea Family : Chenopodiaceae Chromosome No. : 2n = 18, 24 Fore...

Why is (n-1)(n+1)=n^2-1?

The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...