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What is the maximum value of 4(x+7)(2-x), over all real numbers x?

 Nov 9, 2019
 #1
avatar+263 
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If we graph this out, we can see that the maximum for 4(x+7)(2-x) would be 81, for x = -5/2.

 Nov 9, 2019
 #2
avatar+2482 
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You can figure out x=-5/2

 

using the formula -b/2a

 

But first you have to expand

 

then graph the quadratic

 Nov 9, 2019

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