document.write( "Question 98145: Solve algebraically and check your potential solutions: sqrt(x+20)-x=0 \r
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Algebra.Com's Answer #71376 by mathslover(157) $\"\"$ $\"About$

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$\"+sqrt%28x%2B20%29+-x=0\"$
\n" ); document.write( " $\"+sqrt%28x%2B20%29=x\"$
\n" ); document.write( "Square on both sides
\n" ); document.write( " $\"+x%2B20+=+x%5E2+\"$
\n" ); document.write( " $\"x%5E2+-x+-20+=0\"$
\n" ); document.write( " $\"%28x-5%29%28x%2B4%29=0\"$
\n" ); document.write( "x=5 and x= -4\r
\n" ); document.write( "\n" ); document.write( "Checking by putting x=5\r
\n" ); document.write( "\n" ); document.write( " $\"sqrt%285%2B20%29+=+5+\"$
\n" ); document.write( " $\"sqrt%2825%29+=5\"$
\n" ); document.write( " $\"5=5\"$ x=5 is a solution\r
\n" ); document.write( "\n" ); document.write( "Checking by putting x=-4\r
\n" ); document.write( "\n" ); document.write( " $\"sqrt%28-4%2B20%29+=+-4\"$
\n" ); document.write( " $\"sqrt%2816%29=-4\"$
\n" ); document.write( "which is true if we consider the negative root of 16 ie -4\r
\n" ); document.write( "\n" ); document.write( "Solution x=5 and x=-4
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