# Thread:

1. ## Determinant of matrix

Uploaded with ImageShack.us

Is this a 3 by 4 matrix? I know how to find the determinant of a 3 by 3 matrix. How is the determinant calculated for this matrix?

2. You would be trying to evaluate $\displaystyle \left|\begin{matrix}1 & 2 & \phantom{a}-1\\ a & 3 & \phantom{a -}1\\ 2 & 1 & a - 1\end{matrix}\right|$
{"extraction_info": {"found_math": true, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 0, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 1, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0}, "config": {"markdown_headings": true, "markdown_code": true, "boilerplate_config": {"ratio_threshold": 0.18, "absolute_threshold": 10, "end_threshold": 15, "enable": true}, "remove_buttons": true, "remove_image_figures": true, "remove_link_clusters": true, "table_config": {"min_rows": 2, "min_cols": 3, "format": "github"}, "remove_chinese": true, "remove_edit_buttons": true, "extract_latex": true}, "english_confidence": 0.9338977336883545, "perplexity_flag": "head"}