Archive
15th of March 2017
Mathematics
Q:

If a2 + 9/a2 =31, then what is the value of a - 3/a?

Vikas Mahajan - CBSE - Class IX

Wednesday, March 15, 2017 at 15:24:PM

A:

begin mathsize 16px style Given space straight a squared plus 9 over straight a squared equals 31
Adding space minus 6 space on space both space sides comma space we space get
straight a squared minus 6 plus 9 over straight a squared equals 31 minus 6
rightwards double arrow open parentheses straight a minus 3 over straight a close parentheses squared equals 25
rightwards double arrow straight a minus 3 over straight a equals plus-or-minus 5 end style

Wednesday, March 15, 2017 at 15:42:PM