Question

please answer my question ​

Answer 1

Answer:

$8a ^{4} + 2a ^{2} - 45 \\ 8a ^{4} + 20a ^{2} - 18a ^{2} - 45 \\ 4a ^{2} (2a ^{2} + 5) - 9(2a ^{2} - + 5) \\ (2a ^{2} + 5)(4a ^{2} - 9).$