Question

3a^4-243

Answer 1

12 a^3

Answer 2

im sorry i forgot to mention factor completely

Answer 3

is the lcm 9 or 27?

Answer 4

all you can do is factor out a three:
3(a^4-81)

Answer 5

i got that part, just lost after that

Answer 6

Now remember a^2-b^2=(a+b)(a-b)
so

(a^4-81)

factors into

(a^2-9)(a^2+9)

i.e. just take the square root of each term and out it in the form indicated above. Your final answer is then

3(a^2-9)(a^2+9)

Answer 7

sorry wait

(a^2-9)

can be factored in this way to into

(a-3)(a+3)

so your final answer is

3(a^2+9)(a-3)(a+3)

Answer 8

i forgot the middle part