The value of a polynomial in the variable x at the real number x=a is the real number obtained by replacing each occurrence of x in the polynomial by a. For example, the value of 2 x2-x+7 at x=− 3 is 2 (− 3)2-(− 3)+7=2·9+3+7 =
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About solving equations A value c c is said to be a root of a polynomial p(x) p ( x) if p(c) = 0 p ( c) = 0. The largest exponent of x x appearing in p(x) p ( x) is called the degree of p p. If p(x) p ( x) has degree n n, then it is well known that there
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