Question 34

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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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