Question

what is the factored form of (a^2-6) (a^2+4)
the answers that I can choose from are
a^4+ 2a^2+ 24
a^4- 2a^2 +24
a^4- 2a^2 -24
a^4+ 2a^2 -24

Answer 1

(a^2 - 6)(a^2 + 4)

= a^4 + 4a^2 - 6a^2 - 24

= a^4 - 2a^2 - 24

Its the third choice.