Simplify frac x x y frac y x - y - frac x 2 x 2... - JAMB Mathematics 1990 Question
Simplify \(\frac{x}{x + y}\) + \(\frac{y}{x - y}\) - \(\frac{x^2}{x^2 - y^2}\)
A
\(\frac{x}{x^2 - y^2}\)
B
\(\frac{y^2}{x^2 - y^2}\)
C
\(\frac{x^2}{x^2 - y^2}\)
D
\(\frac{y}{x^2 - y^2}\)
correct option: b
(\frac{x}{x + y}) + (\frac{y}{x - y}) - (\frac{x^2}{x^2 - y^2})
(\frac{x}{x + y}) + (\frac{y}{x - y}) - (\frac{x^2}{(x + y)(x - y})
= (\frac{x(x - y) + y(x + y) - x^2}{(x + y)(x - y})
= (\frac{x^2 + xy + xy + y^2 - x^2}{(x + y)(x - y})
= (\frac{y^2}{(x + y)(x - y)})
= (\frac{y^2}{(x^2 - y^2)})
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