Question

75 x 77
53 x 21
simplify and express in the exponential form​

Answer 1

Answer:

5775 & 1113 respectively.

Step-by-step explanation:

(a + b) (a - b) = a² - b²

75 × 77 = (76-1) (76+1).

= (76)² - 1²

= 5776 - 1

= 5775

53 × 21 = (37 + 16) (37 - 16)

= (37)² - (16)²

= 1369 - 256

= 1113