Aparabola opens down if the value of “blank” is negative in the general form of the equation

Can somebody me out with this question

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12