Question

Factorise : 625² − 121² by using suitable identity​

Answer 1

(625 - 121)(625 + 121)

Explanation:

625² - 121² ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b)

then

625² - 121²

= (625 - 121)(625 + 121) ← in factored form