document.write( "Question 84685: solve using Q. F. Formula x=-b+- sq b-4ac/2a\r
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\n" ); document.write( "\n" ); document.write( "2x^2+x-1=0 the answer is 1/2,1\r
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\n" ); document.write( "\n" ); document.write( "I'm new to these so please help....thanks! \n" ); document.write( "

Algebra.Com's Answer #61011 by Earlsdon(6294) $\"\"$ $\"About$

You can put this solution on YOUR website!
Solve using the quadratic formula: $\"x+=+%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F2a\"$
\n" ); document.write( " $\"2x%5E2%2Bx-1+=+0\"$ Here, a = 2, b = 1, and c = -1 So, making the appropriate substitutions, we get:
\n" ); document.write( " $\"x+=+%28-1%2B-sqrt%281%5E2-4%282%29%28-1%29%29%29%2F2%282%29\"$ Now simplify this.
\n" ); document.write( " $\"x+=+%28-1%2B-sqrt%281%2B8%29%29%2F4\"$
\n" ); document.write( " $\"x+=+%28-1%2B-sqrt%289%29%29%2F4\"$
\n" ); document.write( " $\"x+=+%28-1%2B3%29%2F4\"$ or $\"x+=+%28-1-3%29%2F4\"$
\n" ); document.write( " $\"x+=+1%2F2\"$ or $\"x+=+-1\"$ Note the negative on the 1. \n" ); document.write( "

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