Cramer’s rule

Type your name in to state that you are watching the video. Understand you have one chance on the questions for a grade all questions come from the video. Multiple choice questions give you one minute and open ended give you 3 minutes.

Which is the correct way to find the determinate?

• The upward diagonal plus the downward diagonal.

• The downward diagonal minus the upward diagonal.

• The upward diagonal minus the downward diagonal.

• The downward diagonal plus the upward diagonal.

What is the extra step we have to remember when finding the determinate of a 3x3?