Question 739378
Write f(x)=-9x^2+18x in standard form.
complete the square:
{{{f(x)=-9(x^2-2x+1)+9}}}
{{{f(x)=-9(x-1)^2+9}}}
This is an equation of a parabola that opens downward.
Its standard form: {{{y=-A(x-h)^2+k}}}, (h,k)=(x,y) coordinates of the vertex, A is a coefficient that affects the slope or steepness of the curve.
For given equation:
vertex:(1,9)