Question

(a + 3) (a -3) (a²+9) ​

Answer 1

Answer:

$a^{4} -81$

Step-by-step explanation:

(a + 3) (a -3) (a²+9) ​

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

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

= $(a^{2})^{2} - 9^{2}$

= $a^{4} -81$