Even Power of Negative Real Number
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Theorem
Let $x \in \R$ be a real number.
Let $n \in \Z$ be an even integer.
Then:
- $\paren {-x}^n = x^n$
Proof
From Real Numbers form Ordered Field, $\R$ is a field.
By definition, $\R$ is therefore a ring.
The result follows from Power of Ring Negative.
$\blacksquare$