The binary operation \( \oplus \) is defined by \( x \ast y = xy - y - x \) for all real values \( x \) and \( y \). If \( x \ast 3 = 2 \ast \), find \( x \...

Assessment: JAMB UTME - Mathematics - 1998 Subject: General Mathematics

Question 1 Report

The binary operation \( \oplus \) is defined by \( x \ast y = xy - y - x \) for all real values \( x \) and \( y \). If \( x \ast 3 = 2 \ast \), find \( x \)

Answer Details
x  ∗  y = xy - y - x, x  ∗  3 = 3x - 3 - x = 2x - 3
2  ∗  x = 2x - x - 2 = x - 2
∴ 2x - 3 = x - 2
x = -2 + 3
= 1

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