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OpenStudy (anonymous):

factor: zr-zf+cr-cf

jigglypuff314 (jigglypuff314):

if you see that more or more terms have something in common you can factor it out :) so like zr - zf have a z in common right? so you can factor out a z to become z(r-f)

jigglypuff314 (jigglypuff314):

you would then use the same idea for cr - cf which has a c in common

OpenStudy (anonymous):

got t thanks :)

jigglypuff314 (jigglypuff314):

you're welcome :)

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