document.write( "Question 47606This question is from textbook
\n" ); document.write( ": Please assist us with this question..\r
\n" ); document.write( "\n" ); document.write( "In the following exercises, v denotes the vertex of a parabola, f the focus and d the directrix. Two of these are given. Find the third.\r
\n" ); document.write( "\n" ); document.write( "f(-2,5) v(-2,+1)\r
\n" ); document.write( "\n" ); document.write( "Thanks! \n" ); document.write( "

Algebra.Com's Answer #31436 by Nate(3500) $\"\"$ $\"About$

You can put this solution on YOUR website!
The distance between the focus and the vertex is the exact distance from the vertex and the directrix vertically.
\n" ); document.write( "The distance is 4 units.
\n" ); document.write( "The directrix goes through (-2,-3); since the directrix is a horizontal line, the directrix is $\"y+=+-3\"$ .
\n" ); document.write( " $\"graph%28600%2C600%2C-10%2C10%2C-10%2C10%2C%281%2F16%29%28x+%2B+2%29%5E2+%2B+1%2C+-3%29\"$ \n" ); document.write( "

\n" );