Question

9a²b²-25 factorise please factorise

Answer 1

Step-by-step explanation:

9a²b² - 25

= (3ab)² - 5²

= (3ab + 5)(3ab - 5)

Answer 2

Answer:

Step-by-step explanation:

$9a^{2} b^{2}-25[tex]</p><p>=[tex](3ab)^{2} -5^{2}$      (∵$a^{2} -b^{2} = (a-b) (a+b)$)

= (3a+5) (3a-5)