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 -...
The basic answer is that you cross-multiply the values in each factor: (n - 1)(n + 1) n^2 - n + n -...
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Astronomers ran 100,000 computer simulations using combined Hubble/Gaia space telescope data.