document.write( "Question 195478: explain how you can tell whether a parabola opens upward, downward, to the left, or to the right \n" ); document.write( "
Algebra.Com's Answer #146617 by stanbon(75887)\"\" \"About 
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explain how you can tell whether a parabola opens upward, downward, to the left, or to the right
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\n" ); document.write( "The x^2 or y^2 term is the deciding element.
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\n" ); document.write( "y = x^2 opens upward
\n" ); document.write( "y = -x^2 opens downward
\n" ); document.write( "x = y^2 opens to the right
\n" ); document.write( "x = -y^2 opens to the left
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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