Question

Evaluate, using the identities

(i) 505 x 503,​

Answer 1

Answer:

505 x 503 = (500 + 5) (500 + 3)

                    = 5002 + (5 + 3) (500) + 5 x 3

                    = 250000 + 4000 + 15 = 254015(ii) 37 x 26 = (30 + 7) (30 - 4)                 = 302 + (7 - 4) (30) - 7 x 4

                 = 900 + 90 - 28 = 962