Greatest Common factors

I don't know these answers. Can you help me? Greatest common factor in 1.6y^2-9y+18.
2.4x^2y-7xy
3. 30a^3b-40ab^3
4. factor out greatest common factor in 4x^2-12x+20
5. x^4y-6x^3y-6x^2y
4 and 5 are factoring out the greatest common and 1-4 is finding the greastest common factor.

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1. The greatest common factor is the highest number (or variable, or both) that you can divide each part by.
1. 3
4. The GCF is 4, so when you divide each part by 4 you get x^2-3x+5
Try the rest, and submit them if you want them checked.

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2. Thanks alot. I got an A on my assignment.

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3. >) Well dumb chess weakling, all i know iz the answer to 30a^3b-40ab^3 4 iz 10ab >)
>( that's it! >(

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4. >)MWA HAHAHAHAHA >) CHESS WEAKLING!

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5. Greatest common factor for 39,6

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