How do you do this? Thanks for your time and effort! Plz help:)))))) THANKSSSSS

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Nicogpt · Answer 1 · 2018-03-16T20:42:21+0000

R=-1/800(x^2-2400x)
use R'=0
R'=1/400x-300, 1/400x=300 => x=1200 critical point
take R(1200), we know its max bcuz of the orientation of R