document.write( "Question 981021: Please help me with this problem: given the distance between (x,1) and (-2,5) is 2 sqrt (7) find the value of x. \n" ); document.write( "

Algebra.Com's Answer #602048 by Fombitz(32388) $\"\"$ $\"About$

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Use the distance formula.
\n" ); document.write( " $\"D%5E2=%28x%5B1%5D-x%5B2%5D%29%5E2%2B%28y%5B1%5D-y%5B2%5D%29%5E2\"$
\n" ); document.write( " $\"%282sqrt%287%29%29%5E2=%28x-%28-2%29%29%5E2%2B%281-5%29%5E2\"$
\n" ); document.write( " $\"28=%28x%2B2%29%5E2%2B16\"$
\n" ); document.write( " $\"%28x%2B2%29%5E2=12\"$
\n" ); document.write( " $\"x%2B2=0+%2B-+sqrt%2812%29\"$
\n" ); document.write( " $\"x=-2+%2B-+2sqrt%283%29\"$
\n" ); document.write( "Two possible points
\n" ); document.write( "( $\"-2%2B2sqrt%283%29\"$ , $\"1\"$ ) and ( $\"-2-2sqrt%283%29\"$ , $\"1\"$ ) \n" ); document.write( "

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