If \(X \ast Y = X + Y - XY\), find x when \((x \ast 2) + (x \ast 3) = 68\)

Assessment: JAMB UTME - Mathematics - 1997 Subject: General Mathematics

Question 1 Report

If \(X \ast Y = X + Y - XY\), find x when \((x \ast 2) + (x \ast 3) = 68\)

Answer Details
x  ∗  y = x + y - xy
(x  ∗  2) + (x  ∗  3) = 68
= x + 2 - 2x + x + 3 - 3x
= 86
3x = 63
x = -21

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