document.write( "Question 198634: can someone help
\n" ); document.write( "y=2x^2-4x-1
\n" ); document.write( "the vertex (1,-3)
\n" ); document.write( "y-intercept (0,-1)
\n" ); document.write( "the x-intercepts
\n" ); document.write( "enter the x-intercept with the smaller x value
\n" ); document.write( "( , 0 )??
\n" ); document.write( "enter the x-intercept with the larger x value
\n" ); document.write( "(2.224,0)
\n" ); document.write( "can not figure out the the first part of the smaller x value question
\n" ); document.write( "can someone help please \n" ); document.write( "

Algebra.Com's Answer #149159 by edjones(8007) $\"\"$ $\"About$

You can put this solution on YOUR website!
2x^2-4x-1=0
\n" ); document.write( "x^2-2x-(1/2)=0 divide each side by 2
\n" ); document.write( "x^2-2x=.5
\n" ); document.write( "x^2-2x+1=1.5 completing the square.
\n" ); document.write( "(x-1)^2=1.5
\n" ); document.write( "x-1=+-sqrt(1.5)
\n" ); document.write( "x=1+-sqrt(1.5)
\n" ); document.write( "x=1-sqrt(1.5)= -0.225
\n" ); document.write( "x=1+sqrt(1.5)= 2.225
\n" ); document.write( ".
\n" ); document.write( "It is more exact and less of a mess with decimal points and rounding if you keep it 1+-sqrt(1.5)
\n" ); document.write( ".
\n" ); document.write( "Ed
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\n" ); document.write( " $\"graph%28500%2C500%2C-10%2C10%2C-10%2C10%2C2x%5E2-4x-1%29\"$ \n" ); document.write( "

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