Question

If '*
operation be defined as a * b = a × b - (a + b), evaluate :
(i) 2 * 5
(ii) (-4) * (- 6)
(iii) 13 * (-6)​

Answer 1

i.a*b=a×b-(a+b)

=2*5=2×5-(2+5)

2*5=10-7=3ans.

ii.a*b=a×b-(a+b)

=(-4)*(-6)=(-4)×(-6)-[(-4)+(-6)]

(-4)*(-6)=24+(-10)=34ans.