document.write( "Question 943223: Hello,
\n" ); document.write( "Can someone help me with this \"Completing the Square\" problem?\r
\n" ); document.write( "\n" ); document.write( "I know there's a way of solving expressions that have a negative \"x\" squared, but I would really like someone to explain the solution using the \"(x-h)^2=p\" form.
\n" ); document.write( "This is the problem, thank you in advance:
\n" ); document.write( "\"Solve by completing the square: -4x^2+3x+7=0\"
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Algebra.Com's Answer #575044 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
I can show you the way I do it
\n" ); document.write( "\"+-4x%5E2+%2B+3x+%2B+7+=+0+\"
\n" ); document.write( "Subtract \"+7+\" from both sides
\n" ); document.write( "\"+-4x%5E2+%2B+3x+=+-7+\"
\n" ); document.write( "Divide both sides by \"+-4+\"
\n" ); document.write( "\"+x%5E2+-%28+3%2F4+%29%2Ax+=+%28-7%29%2F%28-4%29+\"
\n" ); document.write( "\"+x%5E2+-%28+3%2F4+%29%2Ax+=+7%2F4+\"
\n" ); document.write( "Take \"+1%2F2+\" of the coefficient of the
\n" ); document.write( "\"+x+\" term, then square it, then add it
\n" ); document.write( "to both sides
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\n" ); document.write( "\"+x%5E2+-%283%2F4%29%2Ax+%2B+%28-3%2F8%29%5E2+=+7%2F4+%2B+%28-3%2F8%29%5E2+\"
\n" ); document.write( "\"+x%5E2+-%283%2F4%29%2Ax+%2B+9%2F64+=+7%2F4+%2B+9%2F64+\"
\n" ); document.write( "\"+x%5E2+-%283%2F4%29%2Ax+%2B+9%2F64+=+112%2F64+%2B+9%2F64+\"
\n" ); document.write( "\"+x%5E2+-%283%2F4%29%2Ax+%2B+9%2F64+=+121%2F64+\"
\n" ); document.write( "Believe it or not, both sides are now perfect squares!
\n" ); document.write( "\"+%28+x+-+3%2F8+%29%5E2+=+%28+11%2F8+%29%5E2+\"
\n" ); document.write( "Take the square root of both sides
\n" ); document.write( "\"+x+-+3%2F8+=+11%2F8+\"
\n" ); document.write( "\"+x+=+14%2F8+\"
\n" ); document.write( "And, using the negative square root of the right side,
\n" ); document.write( "\"+x+-+3%2F8+=+-11%2F8+\"
\n" ); document.write( "\"+x+=+-1+\"
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\n" ); document.write( "So, the factoring would be:
\n" ); document.write( "\"+%28+x+-+14%2F8+%29%2A%28+x+%2B+1+%29+=+0+\"
\n" ); document.write( "\"+x%5E2+-+%2814%2F8%29%2Ax+%2B+x+-+14%2F8+=+0+\"
\n" ); document.write( "\"+x%5E2+-+%28+6%2F8+%29%2Ax+-+14%2F8+=+0+\"
\n" ); document.write( "Multiply both sides by \"+-8+\"
\n" ); document.write( "\"+-8x%5E2+%2B+6x+%2B+14+=+0+\"
\n" ); document.write( "Divide both sides by \"+2+\"
\n" ); document.write( "\"+-4x%5E2+%2B+3x+%2B+7+=+0+\"
\n" ); document.write( "whew! This is a difficult one, but the
\n" ); document.write( "method is always the same\r
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