Proof of continuous function

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Let n >= 0 be an integer, and for each 0 <= i <= n let c_i be a real number. Let P: R-->R be the function P(x) := the sum from i=0 to n of c_i x^i such a function is known as a polynomial of one variable, a typical example is P(x)=6x^4-3x^2+4. Show that P is continuous.

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