Question

2. Factorise :
i) a³- 27
PLZ HELP​

Answer 1

${a}^{3}$

-

${3}^{3}$

(a+3)(a-3)

Answer 2

$\huge\color{cyan}\boxed{\colorbox{black}{ANSWER ❤}}$

${a}^{3} - 27$

${(a)}^{3} - {(3)}^{3}$

WE KNOW THAT:

${a}^{3} - {b}^{3} = (a - b)( {a}^{2} + ab + {b}^{2} )$

$a = a$

$b = 3$

NOW,

$(a - 3)( {a}^{2} + 3a + 9)$