document.write( "Question 120433: The parabola y=x2-4 intersects the x axis at two points, P and Q. What is the distance from P to Q? \n" ); document.write( "

Algebra.Com's Answer #88288 by josmiceli(19441) $\"\"$ $\"About$

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$\"y+=+x%5E2+-+4\"$
\n" ); document.write( " $\"y+=+%28x+%2B+2%29%28x+-+2%29\"$
\n" ); document.write( "set $\"y+=+0\"$ to find roots
\n" ); document.write( " $\"0+=+%28x+%2B+2%29%28x+-+2%29\"$
\n" ); document.write( "The x-intercepts are the values of x that solve this
\n" ); document.write( " $\"x+=+2\"$
\n" ); document.write( " $\"x+=+-2\"$
\n" ); document.write( "So, $\"P+=+-2\"$ and $\"Q+=+%2B2\"$
\n" ); document.write( "The distance apart is $\"Q+-+P+=+2+-%28-2%29\"$
\n" ); document.write( " $\"Q+-+P+=+4\"$ answer \n" ); document.write( "

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