S swampy New member Joined Dec 16, 2008 Messages 5 Dec 17, 2008 #1 162x^2 - 36x + 2 (18x - 2) (9x -1) I think the answer is correct but I cannot figure out how I go it? I know that 18 (9) is 162 -- and 18 + 18 is 36..

162x^2 - 36x + 2 (18x - 2) (9x -1) I think the answer is correct but I cannot figure out how I go it? I know that 18 (9) is 162 -- and 18 + 18 is 36..

mmm4444bot Super Moderator Staff member Joined Oct 6, 2005 Messages 10,251 Dec 17, 2008 #2 18x - 2 can itself be factored, so you're not done. If you had started by factoring out a 2 from the original expression, then you would not have ended up with 18x - 2 as one of the factors.

18x - 2 can itself be factored, so you're not done. If you had started by factoring out a 2 from the original expression, then you would not have ended up with 18x - 2 as one of the factors.

S Subhotosh Khan Super Moderator Staff member Joined Jun 18, 2007 Messages 18,135 Dec 19, 2008 #3 swampy said: 162x^2 - 36x + 2 (18x - 2) (9x -1) I think the answer is correct but I cannot figure out how I go it? I know that 18 (9) is 162 -- and 18 + 18 is 36.. Click to expand... Did you do it by trial & error? Your logic should be: 162 * 2 = 164 = 18*18 and 18 + 18 = 36

swampy said: 162x^2 - 36x + 2 (18x - 2) (9x -1) I think the answer is correct but I cannot figure out how I go it? I know that 18 (9) is 162 -- and 18 + 18 is 36.. Click to expand... Did you do it by trial & error? Your logic should be: 162 * 2 = 164 = 18*18 and 18 + 18 = 36