Question
Factorise: $(x^2– 2xy +y^2) – z^2$
✓
Answer
$(x^2– 2xy +y^2) – z^2$
$= (x – y)^2– z^2. . . .$ [Using Identity $II$
$=(x – y – z) (x – y + z). . . .$ [Using Identity $III$
$= (x – y)^2– z^2. . . .$ [Using Identity $II$
$=(x – y – z) (x – y + z). . . .$ [Using Identity $III$
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