There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (50 + x)(160 - 2x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 60x - 2x^{2} + 8000\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 60x - 2x^{2} + 8000\right)}{dx}\\=&60 - 2*2x + 0\\=& - 4x + 60\\ \end{split}\end{equation} \]

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