If X (ast) Y = X + Y – XY, find x when (x (ast) 2) + (x (ast) 3) = 68
-
A.
24 -
B.
22 -
C.
-12 -
D.
-21
Correct Answer: Option D
Explanation
x (ast) y = x + y – xy
(x (ast) 2) + (x (ast) 3) = 68
= x + 2 – 2x + x + 3 – 3x
= 86
3x = 63
x = -21
x (ast) y = x + y – xy
(x (ast) 2) + (x (ast) 3) = 68
= x + 2 – 2x + x + 3 – 3x
= 86
3x = 63
x = -21