There are 1 questions in this calculation: for each question, the 2 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ second\ derivative\ of\ function\ \frac{{(4x + 5)}^{2}}{8}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 2x^{2} + 5x + \frac{25}{8}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 2x^{2} + 5x + \frac{25}{8}\right)}{dx}\\=&2*2x + 5 + 0\\=&4x + 5\\\\ &\color{blue}{The\ second\ derivative\ of\ function:} \\&\frac{d\left( 4x + 5\right)}{dx}\\=&4 + 0\\=&4\\ \end{split}\end{equation} \]

Your problem has not been solved here? Please take a look at the  hot problems ！