document.write( "Question 739378: Can someone show me how this is done please .Thanks\r
\n" ); document.write( "\n" ); document.write( "Write f(x)=-9x^2+18x in standard form. \n" ); document.write( "

Algebra.Com's Answer #451096 by lwsshak3(11628) $\"\"$ $\"About$

You can put this solution on YOUR website!
Write f(x)=-9x^2+18x in standard form.
\n" ); document.write( "complete the square:
\n" ); document.write( " $\"f%28x%29=-9%28x%5E2-2x%2B1%29%2B9\"$
\n" ); document.write( " $\"f%28x%29=-9%28x-1%29%5E2%2B9\"$
\n" ); document.write( "This is an equation of a parabola that opens downward.
\n" ); document.write( "Its standard form: $\"y=-A%28x-h%29%5E2%2Bk\"$ , (h,k)=(x,y) coordinates of the vertex, A is a coefficient that affects the slope or steepness of the curve.
\n" ); document.write( "For given equation:
\n" ); document.write( "vertex:(1,9) \n" ); document.write( "

\n" );