Question

please solve this question​

Answer 1

Step-by-step explanation:

$ac = bd \\ ab + bc = bc + cd \\ here \: i \: have \: broken \: lines \: into \: their \: parts \\ we \: can \: cancel \: bc \\ \\ ab + bc - bc = cd \\ ab = cd \\ \\ hence \: proved$

Answer 2

Answer:

if ab=cd then, subtract both side bc

ac-bc=bd-bc(equal are subtracted from equal whole are equal)

ab=cd(hence proved)

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