Question

a².81 factorise
how can I do it ​

Answer 1

Answer:

Rewrite 81 as 92 . Since both terms are perfect squares, factor using the difference of squares formula, a2−b2=(a+b)(a−b) a 2 - b 2 = ( a + b ) ( a - b ) where a=a and b=9 .

Answer 2

Answer:

9a(9a)

Step-by-step explanation:

a². 81 = a². 9²

= 9a(9a)