document.write( "Question 604295: whats the vertex form of the graph y=x^2+4x-1 \n" ); document.write( "

Algebra.Com's Answer #381098 by lawdej(58) $\"\"$ $\"About$

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use completing the square
\n" ); document.write( " x^2+4x=y+1
\n" ); document.write( " X^2+4x+4=y+1+4
\n" ); document.write( " (x+2)^2=y+5
\n" ); document.write( "vertex=(-2,-5)
\n" ); document.write( "or use the following formula
\n" ); document.write( " (-b/2a,((4ac-b^2)/4a)
\n" ); document.write( " a=1,b=4,c=-1
\n" ); document.write( "(-b/2a,(4ac-b^2/4a)=(-4/(2x1),((4x1x(-1)-4^2)/(4x1))
\n" ); document.write( "=(-4/2,(-4-16)/4)=(-2,-20/4)=(-2,-5) \n" ); document.write( "

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