SOLUTION: Hello and thanks for helping me out in advance. This question is on a take home quiz and I"m not sure how to do it. The directions say to find the greatest common factor here is

Question 133795: Hello and thanks for helping me out in advance. This question is on a take home quiz and I"m not sure how to do it. The directions say to find the greatest common factor here is the question
-12ab, 21a^2, 18ab^2, -21b^2
now where i'm having the trouble is there are no common terms. Or at least I can't see any because there are non that have both an a and b or just an a or b I"m assuming 3 and then something after it but I have no clue..I know it's probably an easy answer but I can't seem to come up with it. Thanks
Christina
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Prime factors of , -1, 2, 2, , a, b (missing a 7)
Prime factors of , , 7, a, a (missing a 2, a b and a -1)
Prime factors of , 2, , 3, a, b, b (missing a 7 and a -1)
Prime factors of , -1, , 7, b, b (missing a 2 and an a)

You are correct. The only factor in common is , so the GCF is 3.
RELATED QUESTIONS
Hello, First off thank you in advance for helping me. My teacher asked me to take this (answered by richard1234)

Hello, (THIS IS VERY URGENT) I'm not sure how to figure out this problem. It has to do... (answered by ewatrrr)

I need help trying to solve this problem. Thank you in advance, for helping me out. I... (answered by josgarithmetic)

I need help trying to solve this problem. Thank you in advance, for helping me out. I... (answered by Fombitz)

Do functions have to be even or odd, necessarily? i have this question here for a take... (answered by kev82)

Hello I just asked this same question, but I'm not sure I wrote it out correctly. Here is (answered by Aaniya,MathTherapy)

Hello, my question is this: How exactly do I find the EXACT value of csc 11pi/2 without... (answered by solver91311)

Draw a right triangle with legs of length 3 cm and 8 cm. Use your triangle to estimate... (answered by josgarithmetic)

Thanks for helping me in advance. I can`t seem to find the answer to this question. Here (answered by stanbon,scott8148)