Please help pre-calculus question?

[alwayslovespets]

I need to find the extremes, intercepts and sketch this equation : -1/2(x+1)(x-2)^2
For x intercepts I got -1,0 and 2,0
for y I got 0,-2
I dont know how to sketch it or find the extremes?

 

[BigGlenntheHeavy]

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