Introduction: A function of the form $y(x)=x^k$, with $k$ a non-negative integer is called a positive integer power function.
Extra explanation 1: $x^k$ means that $x$ is multiplied $k$-times by itself. Hence, $x^k=x \cdot x \cdot \ldots \cdot x$ ($k$-times) for a positive integer $k$.
Extra explanation 2: By definition $x^0=1$.
Extra explanation 3: For every positive integer power function is $x=0$ the only zero.
Extra explanation 1: $x^k$ means that $x$ is multiplied $k$-times by itself. Hence, $x^k=x \cdot x \cdot \ldots \cdot x$ ($k$-times) for a positive integer $k$.
Extra explanation 2: By definition $x^0=1$.
Extra explanation 3: For every positive integer power function is $x=0$ the only zero.