I think it's 12:1 ? Well ratios are easy to do, but seriously I'm still not sure which number comes first ( like the 1 or the 12 ) . I just learned it.
The parabola with with a vertex at (-4,-2) represents any member of parabolas with the equation where is any real number with the exception that .
The reason any equation of the form works is that there are an infinite number of parabolas with a vertex at (-4,-2). All of these parabolas are formed by applying some transformation that involves a vertical translation of -2 and a horizontal translation of -4 on the parabola . The different variations are archived by varying the constant . When is negative, the parabolas will face downwards. When is negative, the parabolas will be face downwards.