document.write( "Question 923563: what is the quadratic equation in the form $\"y=a%28x-h%29%5E2%2Bk\"$ when the parabola:
\n" ); document.write( "opens up, compressed by a factor of 2, with a vertex at (-1,3) \n" ); document.write( "

Algebra.Com's Answer #560217 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Vertex at ( -1,3 )
\n" ); document.write( " $\"+y+=+a%2A%28+x-%28-1%29+%29%5E2+%2B+3+\"$
\n" ); document.write( " $\"+y+=+a%2A%28+x%2B1+%29%5E2+%2B+3+\"$
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\n" ); document.write( "Compressed by a factor of $\"+2+\"$ would be:
\n" ); document.write( " $\"+y+=+2a%2A%28+x%2B1+%29%5E2+%2B+3+\"$
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\n" ); document.write( "check:
\n" ); document.write( "Suppose $\"+a+=+5+\"$
\n" ); document.write( "Original equation:
\n" ); document.write( "(1) $\"+y+=+5%2A%28+x%2B1+%29%5E2+%2B+3+\"$
\n" ); document.write( "Compressed equation:
\n" ); document.write( "(2) $\"+y+=+10%2A%28+x%2B1+%29%5E2+%2B+3+\"$
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\n" ); document.write( "Here are plots of the equations:
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