document.write( "Question 914011: each point lies on a parabola that has its vertex at (0,1). Write the equation of the parabola. Indicate whether the graph opens up or down. Parabola is (2,-1) \n" ); document.write( "

Algebra.Com's Answer #554836 by josgarithmetic(39617) $\"\"$ $\"About$

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It seems to open down. POINT (not Parabola) on the parabola is (2,-1).\r
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\n" ); document.write( "\n" ); document.write( " $\"y=a%28x-0%29%5E2%2B1\"$ , using standard form and the given vertex. You want to use the other known point to find the value for the factor a.\r
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\n" ); document.write( "\n" ); document.write( " $\"y=ax%5E2%2B1\"$
\n" ); document.write( " $\"y-1=ax%5E2\"$
\n" ); document.write( " $\"a=%28y-1%29%2Fx%5E2\"$ \r
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\n" ); document.write( "\n" ); document.write( "Do the rest. \n" ); document.write( "

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