4n^2-36??

Printable View

- April 17th 2008, 08:10 PMhelpmeefactoring trinomials?
4n^2-36??

- April 17th 2008, 08:18 PMJen
Factor out a 4 and use the difference of squares.

Give it a try. It is similar to the earlier ones we did. - April 17th 2008, 08:20 PMhelpmee
so n^2-8?

i dont know what to do after that... - April 17th 2008, 08:21 PMJen
so your solution should look like Where c is some constant. Remember that you should be able to multiply it all back out and it should look like the original.

- April 17th 2008, 08:22 PMo_O

Since - April 17th 2008, 08:22 PMJen
- April 17th 2008, 08:24 PMhelpmee
mmkay the other one... 27t^2+18t+9 my teacher said its (x-1)(3x+1)...

- April 17th 2008, 08:29 PMJen
Which is a bit different than the one we started with.

- April 17th 2008, 08:31 PMhelpmee
?? so hes wrong??

- April 17th 2008, 08:33 PMJen
- April 17th 2008, 08:38 PMhelpmee
hmm so whats the correct factoring? becuase heres his reasoning...

27t^2+18t+9

so

3t^2-2t+1

and then you do

(1x-1) (3x+1)

and thats because FOIL

so -1x(3x)=-3x

and -1(1)=2x

so the answer when you put them together is -2 which is in the 3t^2+18t+9...

i dont get that...does it make sense?

and no i DID copy it right thats why im so confused too.. - April 17th 2008, 09:55 PMo_O
How did the negative sign appear randomly?

which can't be factored.