I normally write my solutions to mathematics problems in Latex using the begin/end{align*} feature.
How does one highlight an equation, or answer in my case, when the code is in begin/end{align*} ?
See my code below:
\begin{align*} %-- i^7 &= 1 \times i^3 \\[5mm] %-- i^7 &= i^3 \\[5mm] %-- i^7 &= i^2 \times i \\[5mm] %-- i^7 &= -1 \times i \\[5mm] %-- i^7 &= -i \\[5mm] %-- i^7 &= -i \end{align*} So I would like to highlight the last line BUT maintain the alignment
Thanks
This problem can be concluded as colorbox inside align, so we can use
\documentclass{article} \usepackage{xcolor} \usepackage{mathtools} % Reference: https://tex.stackexchange.com/a/13693/234654 \newlength\dlf \newcommand\alignedbox[2]{ % #1 = before alignment % #2 = after alignment & \begingroup \settowidth\dlf{$\displaystyle #1$} \addtolength\dlf{\fboxsep+\fboxrule} \hspace{-\dlf} \fcolorbox{yellow}{yellow}{$\displaystyle #1 #2$} \endgroup } \begin{document} \begin{align*} %-- i^7 &= 1 \times i^3 \\[5mm] %-- i^7 &= i^3 \\[5mm] %-- i^7 &= i^2 \times i \\[5mm] %-- i^7 &= -1 \times i \\[5mm] %-- i^7 &= -i \\[5mm] %-- \alignedbox{i^7}{=-i} \end{align*} \end{document} This genius idea is borrowed from here.
This method calculates the length before the aligned mark & into variable \dlf. Then \hspace is used to left shift the colorbox. Now the alignment is achieved.
\color{}within a{}.)\color{}maintain the alignment so that all the equal signs are under each other?\color{red} i^7 & \color{red}=-iand it looks right. (No{}needed inalignenvironment.)i^7 = -i.\documentclass{article} \usepackage{xcolor} \usepackage{mathtools} % or \usepackage{amsmath} \begin{document} \begin{align*} %-- i^7 &= 1 \times i^3 \\[5mm] %-- i^7 &= i^3 \\[5mm] %-- i^7 &= i^2 \times i \\[5mm] %-- i^7 &= -1 \times i \\[5mm] %-- i^7 &= -i \\[5mm] %-- \color{red} i^7 & \color{red} =-i \end{align*} \end{document}Result: image