Question

Find product using suitable identity (a+3)(a-3)​

Answer 1

Answer:

( a + b ) ( a - b ) = a² - b²

( a + 3 ) ( a - 3 ) = a² - 3²

===> a² - 9 = 0

====> a² = 9

====> a = √9

====> a = 3

Answer 2

Answer:

using a^2 - b^2 identity

i.e.

a^2-3^2

= a^2 - 9