document.write( "Question 288676: (the square root of X+2) = x? How do I solve this?\r
\n" ); document.write( "\n" ); document.write( "ALSO: (the square root of 2-x) = 2-x How do I solve this?
\n" ); document.write( "

Algebra.Com's Answer #209213 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
# 1\r
\n" ); document.write( "\n" ); document.write( "\"sqrt%28x%2B2%29+=+x\" Start with the given equation.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x%2B2+=+x%5E2\" Square both sides.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"0+=+x%5E2-x-2\" Get everything to one side.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x%5E2-x-2=0\" Rearrange the equation.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"%28x-2%29%28x%2B1%29=0\" Factor.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x%2B2=0\" or \"x%2B1=0\" Use the zero product property.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x=2\" or \"x=-1\" Solve for 'x' in each case.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So the possible solutions for \"sqrt%28x%2B2%29+=+x\" are \"x=2\" or \"x=-1\". However, if you plug \"x=-1\" into \"sqrt%28x%2B2%29+=+x\", you'll get \"1=-1\" which is NOT true. So \"x=-1\" is NOT a solution.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So the only solution is \"x=2\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "==================================================================\r
\n" ); document.write( "\n" ); document.write( "# 2\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"sqrt%282-x%29=2-x\" Start with the given equation.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"2-x=%282-x%29%5E2\" Square both sides.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"2-x=4-4x%2Bx%5E2\" FOIL\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"0=4-4x%2Bx%5E2%2Bx-2\" Get everything to one side.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"0=x%5E2-3x%2B2\" Combine like terms.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"0=%28x-2%29%28x-1%29\" Factor.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x-2=0\" or \"x-1=0\" Use the zero product property.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"x=2\" or \"x=1\" Solve for 'x' in each case.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So the possible solutions are \"x=2\" or \"x=1\". If you plug in each solution to check, you'll find that they both work. \r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "So the solutions are \"x=2\" or \"x=1\"
\n" ); document.write( "
\n" );