7 + 5x4 - 8 + 4x3 + 3x4 + 15 =

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A polynomial refers to more than one monomial or, in other words, it refers to two or more monomial numbers that are linked together through an equation by an addition sign (+), subtraction sign (-) or a multiplication sign (x).  “Poly” refers to “many.” 


7 + 5<i>x</i><sup>4</sup> - 8 + 4<i>x</i><sup>3</sup> + 3<i>x</i><sup>4</sup> + 15 =