Question 31

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Jambmaths question: 

The binary operation * is defined $x*y=xy-y-x$ for real values of x and y. If $x*3=2*x$, find the value of x

Option A: 

–1

Option B: 

–2

Option C: 

1

Option D: 

5

Jamb Maths Solution: 

$\begin{align}  & x*3=2*x \\ & 3x-3-x=2x-x-2 \\ & 2x-3=x-2 \\ & x=1 \\\end{align}$

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