Question

factorise （X square -1）​

Answer 1

x²-1

= (x)²-(1)²

= (x+1)(x-1)

Answer 2

Step-by-step explanation:

${     {x}^{2}-1      }$

$\implies{    {x}^{2}-{1}^{2}       }$

$\boxed{\blue{  a^2-b^2=(a+b)(a-b)      }   }$

$\implies{ (x+1)(x-1)          }$