Question 300155

I like your questions

I hope I understand your questions
For every unknown (a different letter), you need another equation.
Let's say you just have x then you only need one equation .
If you have x and y then you need two equations 
If you have x, y, and z then you need three equations.

Do you mean when are there no real solutions or no solutions?
There are always solutions to a quadratic equation.
The determinant (b^2-4ac) will tell you what type (real, imaginary, rational, irrational) and how many there are.

Answers can be left in fraction form. They are more exact than the decimal form.
Sometimes the teacher will want an answer in decimal form rounded to one or two places because there are roots with radicals etc.


What do you mean by  a really big number? And what is wrong with really big numbers? Wouldn't you like a really big number of dollars?


The vertex will have an x and a y in the point such as (3,4)
the 3 is the x and the 4 is the y
-b/2a is the x value of the vertex when the equation is in the form ax^2+bx+c=0 or ax^2+bx=c
then plug in that value of x to find the y of the point y=ax^2+bx+c or