Question

4a^2+81-36a
Factor.

Answer 1

(2a-9)^2

Answer 2

\[(9-2a)(9-2a)\]

Answer 3

4a^2+81-36a


4a^2-36a+81


4a^2-18a-18a+81


(4a^2-18a)+(-18a+81)


2a(2a-9)+(-18a+81)


2a(2a-9)-9(2a-9)


(2a-9)(2a-9)

Answer 4

oh and you can keep going to get (2a-9)^2

Answer 5

saifoo is wrong

Answer 6

Agent Double Zero at it again

Answer 7

Am i? :P

Answer 8

no he's right

Answer 9

It's the same answer, its not wrong =/

Answer 10

Prove im wrong.

Answer 11

im right, and i knw.

Answer 12

It looks wrong

Answer 13

Another vote for saifoo.

Answer 14

Get your eyes checkd @hero.

Answer 15

(2a - 9)(2a - 9)
a = 9/2

Answer 16

It's right
http://www.wolframalpha.com/input/?i=4a%5E2%2B81-36a

Answer 17

we have a hero copycat

Answer 18

So basically (2a - 9)^2 = (9-2a)^2

That's apparently what you're telling me

Answer 19

Yes. (-1)^2 = 1.

Answer 20

Dont give excuses now hero.

Answer 21

I'm still calling you agent double zero regardless

Answer 22

yep, because taking the square root of both sides gives us

\[\Large |2a-9|=|9-2a|\]

\[\Large |2a-9|=|-1(-9+2a)|\]

\[\Large |2a-9|=|-1(2a-9)|\]

\[\Large |2a-9|=|-1|*|2a-9|\]

\[\Large |2a-9|=1*|2a-9|\]

\[\Large |2a-9|=|2a-9|\]


Now square both sides again to get


\[\Large (2a-9)^2=(2a-9)^2\]


So this shows us that \[\Large (2a-9)^2=(9-2a)^2\]

Answer 23

lol, but you were pointless.

Answer 24

Saifoo, I always said you remind me of Lex Luthor

Answer 25

Dont change the topic now. :p

Answer 26

I'm not. Everytime you say something you only prove what I say about you being the reincarnation of Lex

Answer 27

@hero You can use the FOIL method to check saifoo's answer. FOIL = First, Outer, Inner, Last.

Answer 28

dmancine, I didn't ask for any tips from you. I already checked it

Answer 29

no need to bite his head off, he's just trying to help

Answer 30

yw ;)

Answer 31

Once again, I didn't ask and also, I didn't bite his head off. I'm not Lex, I wouldn't do that.

Answer 32

now who is lex luthor

Answer 33

Hero ofc

Answer 34

evil inside

Answer 35

I think he put the sticker on his forehead