document.write( "Question 358140: solve x^2+18x-4=0 simplify your answers. Use a comma to separate answers as needed. Type an exact answer, using radicals as needed. Type each solution only once. \n" ); document.write( "

Algebra.Com's Answer #255803 by jsmallt9(3758) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"x%5E2%2B18x-4=0\"$
\n" ); document.write( "This is a quadratic equation. After you get one side to be zero, you either factor the non-zero side or use the Quadratic Formula. Since we already have one side equal to zero and since the non-zero side cannot be factored easily, we will go straight to the Quadratic Formula, $\"x+=+%28-b+%2B-+sqrt%28b%5E2+-4ac%29%29%2F%282a%29\"$ , where the \"a\", \"b\" and \"c\" are from $\"ax%5E2+%2B+bx+%2B+c+=+0\"$ . Your a=1, b=18 and c =-4. So
\n" ); document.write( " $\"x+=+%28-%2818%29+%2B-+sqrt%28%2818%29%5E2+-+4%281%29%28-4%29%29%29%2F%282%281%29%29\"$
\n" ); document.write( "Simplifying:
\n" ); document.write( " $\"x+=+%28-%2818%29+%2B-+sqrt%28324+-+4%281%29%28-4%29%29%29%2F%282%281%29%29\"$
\n" ); document.write( " $\"x+=+%28-18+%2B-+sqrt%28324+%2B+16%29%29%2F2\"$
\n" ); document.write( " $\"x+=+%28-18+%2B-+sqrt%28340%29%29%2F2\"$
\n" ); document.write( " $\"x+=+%28-18+%2B-+sqrt%284%2A85%29%29%2F2\"$
\n" ); document.write( " $\"x+=+%28-18+%2B-+sqrt%284%29%2Asqrt%2885%29%29%2F2\"$
\n" ); document.write( " $\"x+=+%28-18+%2B-+2%2Asqrt%2885%29%29%2F2\"$
\n" ); document.write( " $\"x+=+%282%28-9+%2B-+sqrt%2885%29%29%29%2F2\"$
\n" ); document.write( " $\"x+=+%28cross%282%29%28-9+%2B-+sqrt%2885%29%29%29%2Fcross%282%29\"$
\n" ); document.write( " $\"x+=+-9+%2B-+sqrt%2885%29\"$
\n" ); document.write( "In \"long form\" this is:
\n" ); document.write( " $\"x+=+-9+%2B+sqrt%2885%29\"$ or $\"x+=+-9+-+sqrt%2885%29\"$ \n" ); document.write( "

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