Need help pls question 3 pls pls pls

Ineed with number 17 i don’t get it at alll

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.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1