quickly

1. Solving this Matrix quickly in an Exam

Hi all, Does anyone know the best way to answer this maths question quickly? Get from the determinant 1 to the quadratic equation 2. Preferably on a casio calculator, Please see the attachments. Thank you!
2. How to quickly add any number of vectors

Hey guys, if you would like to take a look, here is a lesson I made on how to quickly add multiple vectors without having to add them one by one. Check it out and let me know if you have any question. ZKa_-SN6ZBs
3. Academic Guidance Is is it possible to learn pre-calculus and calculus quickly?

I want to learn pre-calculus and calculus in a couple of months. What is the most efficient way to do so? :D
4. Computing the rank of this matrix quickly?

How do I quickly find the rank of this matrix? A = \left( \begin{array}{ccc} 1 & 2 & 3 & 4 & 5 \\ 6 & 7 & 8 & 9 & 10 \\ 11 & 12 & 13 & 14 & 15 \\ 16 & 17 & 18 & 19 & 20 \\ 21 & 22 & 23 & 24 & 25 \end{array} \right) element a_{ij} = j + 5(i-1) and subtracting from each of the rows i > 1 a...