Question:
Tick (✓) the correct answer:
x2 − xz + xy − yz = ?
(a) (x − y)(x + z)
(b) (x − y)(x − z)
(c) (x + y)(x − z)
(d) (x − y)(z − x)
Solution:
(c) (x + y)(x − z)
$x^{2}-x z+x y-y z$
$=x(x-z)+y(x-z)$
$=(x+y)(x-z)$
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