document.write( "Question 211865: solve: x squared - 4x - 13 = 0 using the quadratic formula \n" ); document.write( "

Algebra.Com's Answer #160074 by checkley77(12844) $\"\"$ $\"About$

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x squared - 4x - 13 = 0
\n" ); document.write( "x^2-4x-13=0
\n" ); document.write( " $\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$
\n" ); document.write( "x=(4+-sqrt(-4^2-4*1*-13])/2*1
\n" ); document.write( "x=(4+-sqrt[16+52])/2
\n" ); document.write( "x=(4+-sqrt68)/2
\n" ); document.write( "x=(4+-8.2462)/2
\n" ); document.write( "x=12.2462/2
\n" ); document.write( "x=6.1231 ans.
\n" ); document.write( "x=(4-8.2462)/2
\n" ); document.write( "x=-4.2462/2
\n" ); document.write( "x=-2.1231 ans. \n" ); document.write( "

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