Question

The identity a² – b² = (a + b)(a – b) is true for all values of a and b. Compute the whole number value of 2021² – 2020²

Answer 1

Step-by-step explanation:

Remark

The numbers here when subtracted, make 1.

ie 2021 - 2020 = 1

So all you have is 2020+2021 = 4041

(2021 - 2020)(2021 + 2020) = 4041

This doesn't work for every number you could choose, but it works for these 2.