Question

Hi! I need to make sure this is right, my teachers strict so it has to be perfect. factor trinomial:
a^4-a^2-42 Thank you! :)

Answer 1

ill type what i got

Answer 2

(a^2-7)(a^2+6) is this correct?

Answer 3

yes :)

Answer 4

*hug* thank you! :)

Answer 5

you could apply difference of squares to the first parentheses if you wanted to though...\[(a^2-7)(a^2+6)=(a-\sqrt7)(a+\sqrt7)(a^2+6)\]but that seems like overkill to me.
You did say your teacher was picky though...

Answer 6

Thats ok, but thanks :)