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What is the maximum value of the expression -5r^2 + 40r - 12 for real r ?

 Oct 21, 2019
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The r that maximizes this is    (-40)/ (2* -5)  =  -40/-10  = 4

 

So......the max value  is

 

-5(4)^2 + 40(4)  - 12   =

 

-80  + 160  - 12  =

 

68

 

cool cool cool

 Oct 21, 2019

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