Question 23

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Jambmaths question: 

A binary operation $\oplus $on real number us defined by $x\oplus y=xy+x+y$for two real numbers x and y. Find the value of $3\oplus -\tfrac{2}{3}$

Option A: 

 –1

Option B: 

2

Option C: 

$\frac{1}{3}$

Option D: 

$-\frac{1}{2}$

Jamb Maths Solution: 

$3\oplus -\tfrac{2}{3}=3\times (-\tfrac{2}{3})+3-\tfrac{2}{3}=-2+3-\tfrac{2}{3}=\tfrac{-6+9-2}{3}=-\tfrac{1}{3}$

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