Jambmaths question:
A binary operation * on the set of rational number is defined as $x*y=\frac{{{x}^{2}}-{{y}^{2}}}{2xy}$ find –5*3
Option A:
$-\tfrac{8}{15}$
Option B:
$\tfrac{8}{15}$
Option C:
$\tfrac{17}{15}$
Option D:
$-\tfrac{17}{15}$
Jamb Maths Solution:
$x*y=\frac{{{(-5)}^{2}}-{{(3)}^{2}}}{2(-5)(3)}=\frac{25-9}{-30}=-\frac{8}{15}$
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