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A portion of the graph of \(f(x)=ax^2+bx+c\) is shown below. The distance between grid lines on the graph is 1 unit.

 


What is the value of a+b+2c?

 May 29, 2020
 #1
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f(x) = - (x+1)2 + 8

f(x) = - (x2 + 2x + 1) + 8

f(x) = -x2 - 2x -1 + 8

f(x) = -x2 - 2x + 7

 

a = -1   b = -2   c = 7

 

a + b + 2c = -1 - 2 - 14 = 11

 

laugh

 May 29, 2020

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