Equations Reducible to Quadratic Form - Part 2

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Shortcuts to do calculations mentally, useful for developing numerical aptitude and for success in competitive examinations.....watch this live stream to master one such important concept of Mathematics.
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sir on 6:59 the avalue of x=40/13 is perhaps incorrect it should be 25/13...


please clear my doubt.

thanks for your precious time

hardikkashyap