I can't understand the order of the polynomial

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I'm reading a book called Bishop - Pattern Recognition and Machine learning. enter image description here

M is the order of the polynomial. I can't understand it. How can I find M? What's number M?

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The order of the polynomial ($M$) is the highest exponent of $x$ that appears in the expression of the polynomial. For example, $x^2$ is a degree-2 polynomial and $1+3x+3x^2+x^3$ is a degree-3 polynomial