\answer{} via the real Ximera runtime

Expand \( (x+8)(x-1) \).

\[ (x+8)(x-1) = \cssId{ximera-placeholder-1}{\phantom{x^2+7x-8\hspace{0.5em}\vphantom{\bigg|}}} \]

Try x^2+7x-8, 7x+x^2-8, (x+8)(x-1) (all correct) and x^2+7x-9 (incorrect). Enter or the Check button grades; a live preview popover appears while typing.