document.write( "Question 801287: I've tried to factor, complete the square and eventually the quadratic formula. I cannot get any of the answers offered. $\"++2x%5E2-2x-1=0\"$ . The available answers all contain imaginary numbers. (A) 1+i (B)1/2 plus or minus i (C) 2+3i (D) 1/2 plus or minus 1/2i \n" ); document.write( "

Algebra.Com's Answer #483493 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
2x^2-2x-1=0.
\n" ); document.write( "The available answers all contain imaginary numbers. (A) 1+i (B)1/2 plus or minus i (C) 2+3i (D) 1/2 plus or minus 1/2i
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\n" ); document.write( "Formula:
\n" ); document.write( "x = [-b+-sqrt(b^2-4ac)]/(2a)
\n" ); document.write( "---
\n" ); document.write( "Your Problem:
\n" ); document.write( "x = [2 +- sqrt(4-4*2*-1)]/(4)
\n" ); document.write( "----
\n" ); document.write( "x = [2 +- sqrt(12)]/4
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\n" ); document.write( "x = [2 +- 2sqrt(3)]/4
\n" ); document.write( "----
\n" ); document.write( "x = (1/2) +- (1/2)sqrt(3)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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