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- Explainer
- Reels
- 9:16
- 0:21
- English
Solve a tricky 3×3 determinant in 10 seconds
“Solve it in 10 seconds”
Amit Yadav@amityadav_0b1e · Published October 28, 2026Starts a new video with the same goal, format, length and quality. Your product, your Brand Kit: nothing from this video is copied.
What's in this video
A 21-second 9:16 explainer video for Instagram Reels, made with pitchboom (Standard quality).
- 1
Hook
Solve it in 10 seconds · |102 18 36| · |1 3 4| · |17 3 6|
VO · Solve this tricky determinant in ten seconds, no expanding.
- 2
Demo
The row operation · R1 → R1 − 6R2
VO · Just take row one, and subtract six times row two.
- 3
Feature
New first row: (96, 0, 12) · 96 · 0 · 12
VO · So the first row becomes ninety-six, zero, twelve,
- 4
Feature
One zero does the work · Zero kills a term · Two terms remain
VO · and that single zero makes the whole expansion collapse.
- 5
Proof
The shortcut · Terms cancel
VO · Then the terms cancel, so the shortcut finishes the job.
- 6
Call to action
More tricky maths questions · Follow
VO · Follow for more tricky maths questions.
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