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Determinants

Level 9 - build-up

3×3 triangular (upper)

6 visual blocks - diagonal and cofactor reading

1

Read the shape

Level 9 visual plan for 3×3 triangular (upper)
Identify matrix size and visible zeros. 3×3 triangular (upper).

Identify matrix size and visible zeros. 3×3 triangular (upper).

2

Pick the method

Determinants: block 2 Visual guide level shape 3×3 triangular (upper)Pick the methodUse diagonals for 2x2; sparse cofactors for 3x3. image-first, then practice
Use diagonals for 2x2; sparse cofactors for 3x3.

Use diagonals for 2x2; sparse cofactors for 3x3.

3

First move

Determinants: block 3 Visual guide level shape 3×3 triangular (upper)First moveChoose the row or column with least work. image-first, then practice
Choose the row or column with least work.

Choose the row or column with least work.

4

Check

Determinants: block 4 Visual guide level shape 3×3 triangular (upper)CheckTrack the sign before calculating. image-first, then practice
Track the sign before calculating.

Track the sign before calculating.

5

Play the mode

Determinants: block 5 Visual guide level shape 3×3 triangular (upper)Play the modeUse the quickest safe method. image-first, then practice
Use the quickest safe method.

Use the quickest safe method.

6

Watch-out

Determinants: block 6 Visual guide level shape 3×3 triangular (upper)Watch-outA zero row or column ends the problem. image-first, then practice
A zero row or column ends the problem.

A zero row or column ends the problem.

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