Question

10. The factors of x2 - 9 is a) (x - 3)(x - 3)​

Answer 1

$\longrightarrow{\blue{}}$ $( {x})^{2} - 9$

$\longrightarrow{\blue{}}$ $( {x})^{2} - ( {3})^{2}$

$\longrightarrow{\blue{}}$ $(x + 3)(x - 3)$

Note:

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