Question

Which of these lines are the narrowest on the graph?

http://img69.imageshack.us/img69/8181/whichgraph.png

Answer 1

y=ax^2+bx+c. The bigger a gets whether it is positive or negative gives the narrowest line. If a is less than 1 the line spreads outwards.

Answer 2

i think you want to find the narrowest parabola, which is y=-4x^2