document.write( "Question 221482: Give exact and approximate solutions to three decimal places.
\n" ); document.write( "y^2-4y+4=9\r
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Algebra.Com's Answer #166111 by RAY100(1637)\"\" \"About 
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y^2 -4y +4 = 9
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\n" ); document.write( "y^2 -4y -5 =0,,,,,,,,,,factor
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\n" ); document.write( "(y-5)(y+1) =0
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\n" ); document.write( "y= 5,,,-1
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\n" ); document.write( "check,,,,(5),,,5^2 -4*5 +4 = 9,,,,,25-20 +4 =9,,,,ok
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\n" ); document.write( "(-1),,,,(-1)^2 -4(-1) +4 = 1+4+4 =9,,,,,,ok
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\n" ); document.write( "If we use thew quadratic formula
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\n" ); document.write( "a= 1,,,,b=-4,,,,c=-5
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\n" ); document.write( "x=[ -(-4) +/- sqrt{ (-4)^2 -4(1)(-5)}] / 2(1)
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\n" ); document.write( "x=[4 +/- sqrt{ 16+20}]/2
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\n" ); document.write( "x=[ 4+/- sqrt36] /2
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\n" ); document.write( "x= [4 +/- 6] /2
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\n" ); document.write( "x= 10/2=5,,,,,,-2/2=-1
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