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Asked by sameerautomobiles | 3rd Aug, 2020, 02:21: PM

Expert Answer:

a+b-c=4 and a2+b2+c2=38
TO find the value of ab - bc - ac
 
straight a plus straight b minus straight c equals 4
rightwards double arrow open parentheses straight a plus straight b minus straight c close parentheses squared equals 16
rightwards double arrow straight a squared plus straight b squared plus straight c squared plus 2 ab minus 2 bc minus 2 ac equals 16
rightwards double arrow 38 plus 2 left parenthesis ab minus bc minus ac right parenthesis equals 16
rightwards double arrow 2 left parenthesis ab minus bc minus ac right parenthesis equals negative 12
rightwards double arrow ab minus bc minus ac equals negative 6

Answered by Renu Varma | 4th Aug, 2020, 11:31: AM