document.write( "Question 705303: For f(x)=ax^2+bx+c, how can we tell if the parabola open up or opens down \n" ); document.write( "

Algebra.Com's Answer #435014 by jsmallt9(3758) $\"\"$ $\"About$

You can put this solution on YOUR website!
If the \"a\" is positive then the parabola opens upward. If the \"a\" is negative then the parabola opens downward. (If \"a\" = 0 then the function is not a parabola.) \n" ); document.write( "

\n" );