celinesitto celinesitto

25-11-2015
Mathematics

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the path of firework is modelled using the equation h= -5d2+20d+1 what is the maximun height?

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Since3122015 Since3122015

25-11-2015

[tex]h=-5d^2+20d+1\\h'=-10d^2+20d=0\\-10d(d-2)=0\\d=0,2\\\\h=-5(2)^2+20(2)+1\\h=-5(4)+40+1\\h=-20+41\\h=21[/tex]

21 units

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