Question

Factorise : x^2y^2-16​

Answer 1

(xy - 4)(xy + 4)

Explanation:

x²y² - 16 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b), thus

x²y² - 16

= (xy)² - 4²

= (xy - 4)(xy + 4)