posted by Elli .
A stunt pilot is testing a new plane. The equation that models his height over time is f(x)=15x^2 -195x +950, where x is his the time in seconds and (fx) is his height in metres. Determine when the pilot is below 500 metres.
Do i sub in 500 metres for f(x)?
Why did you not follow Steve's suggestion when he answered you the last time you posted this question.
He is right, do what he said.