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What is the determinant of a 2 by 2 matrix?

Let A by any 2 by 2 matrix and the top left, top right, bottom left and bottom right entries be a, b, c and d respectively. The determinant for matrix A would be ad-bc.
LG
Answered by Lin G. • Maths tutor
4338 Views

Person A, weighing 35 kg, is sitting 10m away from a seesaw pivot. Person B, weighing 50 kg, it sitting at the other end, at a distance d. Calculate d, in order for the seesaw not to topple over. (g=10m/s^2)

Force@A: F A = m A x g = 35 x 10 = 350NAnticlockwise moment: M A = F A x d A = 350 x 10 = 3500NmForce @B: F B =m b x g = 50 x 10 = 500NClockwise moment: M c = F B x d B For the seesaw to be in equilibrium, M...
AA
Answered by Antonia A. • Physics tutor
2659 Views

How can I improve my French accent?

EXPOSURE! Listen to French radio (there are plenty of apps for that).Watch French films - if you struggle with comprehension, stick on the French subtitles. If that's still to difficult, turn on the English ...
ED
Answered by Ellen D. • French tutor
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Briefly evaluate the biological approach in Psychology. (6 marks - AQA style)

One strength of the biological approach is that it has real-life application. For example, a modern understanding of biochemical processes within the brain has led to the development of psychoactive drugs wh...
JH
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Make x the subject of the equation. 7xy+6 = 18x+3y+7

Put all the terms which contain x onto one side of the equation.-6 from both sides of the equation and -18x from both sides of the equation to get7xy-18x = 3y+7-6Simplify if possible7xy-18x = 3y+1Take the x ...
LM
Answered by Lucy M. • Maths tutor
3549 Views