How to quickly solve a quadratic equation

[retoa]

(02-18-2016 07:35 AM)MattH Wrote:  Second, what is the purpose of the 'plus or minus' symbol inside the vector brackets?

The +/- symbol in vectors/matrices permits you to add a column/row. It's a sort of placeholder when you navigate in the vector/matrix with the cursor or finger.

When you separate the values with comma it does nothing.