#A/B=B/A" "# is true if?
2 Answers
Jun 24, 2018
# A= +- B #
Explanation:
If
#A/B * AB = B/A * AB#
# :. A^2 = B^2#
# :. A^2 - B^2 = 0#
# :. (A-B)(A+B)= 0#
# { (A-B= 0=> A=B), (A+B= 0=> A=-B) :} #
Thus there are two possibilities
# A= +- B #
Cross multiply
Explanation:
as above