help me to solve this question from chapterwise revision question number 32.
 
 
If a-1/a=3; 
find a2+3a+1/a2-3/a
 
 

Asked by Yesan | 12th Mar, 2017, 12:12: PM

Expert Answer:

begin mathsize 16px style If space straight a minus 1 over straight a equals 3
Squaring space both space sides comma
rightwards double arrow space open parentheses straight a minus 1 over straight a close parentheses squared equals 3 squared
rightwards double arrow straight a squared plus 1 over straight a squared minus 2 equals 9
rightwards double arrow straight a squared plus 1 over straight a squared equals 11
Consider comma
straight a squared plus 3 straight a plus 1 over straight a squared minus 3 over straight a
equals straight a squared plus 1 over straight a squared plus 3 straight a minus 3 over straight a
equals 11 plus 3 open parentheses straight a minus 1 over straight a close parentheses
equals 11 plus 3 left parenthesis 3 right parenthesis
equals 11 plus 9
equals 20 end style

Answered by Rebecca Fernandes | 12th Mar, 2017, 01:04: PM