document.write( "Question 293256: does the following parabola open up or down? How can I tell? Thanks! –3x^2 + 90x \n" ); document.write( "
Algebra.Com's Answer #211695 by Earlsdon(6294)\"\" \"About 
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The parabola defined by \"-3x%5E2%2B90x\" opens downward.
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