Question 352252
Choose x values, calculate y values using the function. 
Plot the point.
Connec them with a smooth curve, the more points, the better.
{{{x=-2}}},{{{y=-(-2)^3-4(-2)^2=8-16=-8}}}:(-2,-8)
{{{x=-1}}},{{{y=-(-1)^3-4(-1)^2=1-4=-3}}}:(-1,-3)
{{{x=0}}},{{{y=-(0)^3-4(0)^2=0-0=0}}}:(0,0)
{{{x=1}}},{{{y=-(1)^3-4(1)^2=-1-4=-5}}}:(1,-5)
{{{x=2}}},{{{y=-(2)^3-4(2)^2=-8-16=-24}}}:(2,-24)
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{{{drawing(300,300,-3,3,-25,5,grid(1),
circle(-2,-8,0.12),
circle(-1,-3,0.12),
circle(0,0,0.12),
circle(1,-5,0.12),
circle(2,-24,0.12),
line(-2,-8,-1,-3),
line(-1,-3,0,0),
line(0,0,1,-5),
line(1,-5,2,-24),
graph(300,300,-3,3,-25,5,0))}}}
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The more points you add the smoother the curve as you see here.
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{{{drawing(300,300,-3,3,-25,5,grid(1),
circle(-2,-8,0.12),
circle(-1,-3,0.12),
circle(0,0,0.12),
circle(1,-5,0.12),
circle(2,-24,0.12),
line(-2,-8,-1,-3),
line(-1,-3,0,0),
line(0,0,1,-5),
line(1,-5,2,-24),
graph(300,300,-3,3,-25,5,-x^3-4x^2))}}}