Question

Factorise the following:
a² - 144​

Answer 1

`( a+ 12)(a - 12)`

Explanation:

`{a}^(2) - 144`

`{a}^(2) - {12}^(2)`

Since both terms are perfect squares, factor using the difference of squares formula,

`{a}^(2) - {b}^(2) = ( a+b )(a - b)`

where a=a and b=12.

`(a+ 12)(a - 12)`

Hope it is helpful....