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If x is a real number, what is the maximum possible value of the expression -x^2 + 8t -4?

 Jun 21, 2021
 #1
avatar+33508 
0

-x^2 + 8t -4?

 Jun 21, 2021
 #2
avatar+53 
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Sorry typo!!!

-x^2 + 8x - 4

QuestionableBean  Jun 21, 2021
 #3
avatar+33508 
+2

-x^2 +8x-4       is a dome shaped parabola    the max will occur (at the vertex) at the value of   x = - b/2a    where b = 8   a = -1

                               use this value of 'x' in the equation to calculate the maximum value of the equation

 Jun 21, 2021

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