document.write( "Question 762460: I need to solve by completing the square\r
\n" ); document.write( "\n" ); document.write( "x^2-4X+45 I believe I would first divide by not sure by what since 45 is neg not positive. Thank you for the help walking me through this one so I can do the rest. \n" ); document.write( "

Algebra.Com's Answer #463992 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"+x%5E2+-+4x+%2B+45+=+0+\"$
\n" ); document.write( "Subtract $\"+45+\"$ from both sides
\n" ); document.write( " $\"+x%5E2+-+4x+=+-45+\"$
\n" ); document.write( "Take 1/2 of the coefficient of the $\"x\"$
\n" ); document.write( "term, square it, and add it to both sides
\n" ); document.write( " $\"+x%5E2+-+4x+%2B+%28+-4%2F2+%29%5E2+=+-45+%2B+%28+-4%2F2+%29%5E2+\"$
\n" ); document.write( "Note that when minus is squared, it becomes positive
\n" ); document.write( " $\"+x%5E2+-+4x+%2B+%28+-4%2F2+%29%5E2+=+-45+%2B+%28+-4%2F2+%29%5E2+\"$
\n" ); document.write( " $\"+x%5E2++-+4x+%2B+4+=+-45+%2B+4+\"$
\n" ); document.write( " $\"+x%5E2+-+4x+%2B+4+=+-41+\"$
\n" ); document.write( " $\"+%28+x+-+2+%29%5E2+=+-41+\"$
\n" ); document.write( "Take the square root of both sides
\n" ); document.write( " $\"+x+-+2+=+sqrt%28+41+%29%2Ai++\"$
\n" ); document.write( " $\"+x+=+2+%2B+sqrt%28+41+%29%2Ai+\"$
\n" ); document.write( "and, also
\n" ); document.write( " $\"+x+-+2+=+-sqrt%28+41+%29%2Ai++\"$
\n" ); document.write( " $\"+x+=+2+-+sqrt%28+41+%29%2Ai+\"$
\n" ); document.write( "---------------------
\n" ); document.write( "This would have been much easier if the equation was
\n" ); document.write( " $\"+x%5E2+-+4x+-+45+\"$ -are you sure of the $\"+%2B45+\"$ ?\r
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