document.write( "Question 259972: My book says the answer is -5 and -3, where am I missing it?
\n" ); document.write( " $\"x%5E2-8x-15=0\"$
\n" ); document.write( "x= $\"%28-%28-8%29%2B-+sqrt%28-8%5E2-4%2A1%2A15%29%29%2F%282%2A1%29\"$
\n" ); document.write( "x= $\"8%2B-+sqrt+%2864-60%29%2F%282%29\"$
\n" ); document.write( "x= $\"8%2B-+sqrt+%284%29%2F%282%29\"$
\n" ); document.write( "x= $\"%288%2B2%29%2F%282%29=+10%2F2+=+5\"$
\n" ); document.write( "x= $\"%288-2%29%2F%282%29=+6%2F2+=3\"$ \n" ); document.write( "

Algebra.Com's Answer #191423 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

You can put this solution on YOUR website!
My book says the answer is -5 and -3, where am I missing it?
\n" ); document.write( " $\"x%5E2-8x-15=0\"$ , assume the equation should be x^2 - 8x + 15
\n" ); document.write( "x= $\"%28-%28-8%29%2B-+sqrt%28-8%5E2-4%2A1%2A15%29%29%2F%282%2A1%29\"$
\n" ); document.write( "x= $\"8%2B-+sqrt+%2864-60%29%2F%282%29\"$
\n" ); document.write( "x= $\"8%2B-+sqrt+%284%29%2F%282%29\"$
\n" ); document.write( ":
\n" ); document.write( "Th book is wrong, this would factor to:
\n" ); document.write( "(x-5)(x-3) = 0
\n" ); document.write( "which is:
\n" ); document.write( "x=5,x=3 \n" ); document.write( "

\n" );