document.write( "Question 172484This question is from textbook Introductory Algebra
\n" ); document.write( ": Find the x-intercepts.\r
\n" ); document.write( "\n" ); document.write( "y = x^2 + 4x - 1 \n" ); document.write( "

Algebra.Com's Answer #127364 by jojo14344(1513) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"y+=+x%5E2+%2B+4x+-+1\"$
\n" ); document.write( "Solve by Quadratic:
\n" ); document.write( "where-------> $\"system%28a=1%2Cb=4%2Cc=-1%29\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29\"$
\n" ); document.write( " $\"x=%28-4%2B-sqrt%284%5E2-4%2A1%2A-1%29%29%2F%282%2A1%29=%28-4%2B-sqrt%2816%2B4%29%29%2F2\"$
\n" ); document.write( " $\"x=%28-4%2B-sqrt%2820%29%29%2F2=%28-4%2B-4.472136%29%2F2\"$
\n" ); document.write( "2 values:
\n" ); document.write( " $\"x=%28-4%2B4.472136%29%2F2=0.472136%2F2=highlight%280.2360679%29\"$
\n" ); document.write( " $\"x=%28-4-4.472136%29%2F2=-8.472136%2F2=highlight%28-4.236068%29\"$
\n" ); document.write( "let's see the graph:
\n" ); document.write( "

\n" ); document.write( "Thank you,
\n" ); document.write( "Jojo \n" ); document.write( "

\n" );