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enter image description here

I am having difficulty writing this formula in the LaTeX form. I am not familiar with LaTeX. Thanks in advance.

Zarko
  • 296,517
Avijit
  • 11
  • 3
    Welcome to TeX SX! Should it be an inline formula or a displayed one? – Bernard Aug 26 '21 at 21:22
  • 2
    Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Aug 26 '21 at 21:25

2 Answers2

4

Usually inline mode formula you can do this with the engine pdfLaTeX.

\documentclass[a4paper,12pt]{article}
\usepackage{mathtools,amssymb}
\begin{document}
$M_{S}=k\ast \overline{r_{\mathrm{cf}}}\,/\sqrt{k+k(k-1)\overline{r_{\mathrm{ff}}}}$
\end{document}

enter image description here

Or

\documentclass[a4paper,12pt]{article}
\usepackage{mathtools,amssymb}

\begin{document}
$M_{S}=k\ast \overline{r_{cf}},/\sqrt{k+k(k-1)\overline{r_{ff}}}$
\end{document}

enter image description here

But being your formula build with the font Cambria Math of Office-Word I suggest to use LuaLaTeX engine:

\documentclass[a4paper,12pt]{article}
\usepackage{unicode-math}
\setmathfont{Cambria Math}
\begin{document}
$M_{S}=k\ast \overline{r_{cf}}\,/\sqrt{k+k(k-1)\overline{r_{ff}}}$
\end{document}

....and you will get this that is very closer to your image.

enter image description here

Sebastiano
  • 54,118
4

By use of the nicefrac package and more standard way of writing math expressions:

\documentclass[border=3.141502]{standalone}
\usepackage{nicefrac}

\begin{document}
$M_{S} = \nicefrac{k \overline{r_{\mathrm{cf}}}}
                  {\sqrt{k+k(k-1)\overline{r_{\mathrm{ff}}}}}$
\end{document}

enter image description here

Zarko
  • 296,517