Question
The expanded form of $(x + y - z)^2$ is:
✓
Answer
$(x + y - z)^2 $
$= (x)^2 + (y)^2 + (-z)^2 + 2 \times x \times y + 2 \times y \times (-z) + 2 \times (-z) \times x$
$= x^2 + y^2 + z^2 + 2xy - 2yz - 2zx$
$= (x)^2 + (y)^2 + (-z)^2 + 2 \times x \times y + 2 \times y \times (-z) + 2 \times (-z) \times x$
$= x^2 + y^2 + z^2 + 2xy - 2yz - 2zx$
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