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The graph of $y = ax^2 + bx + c$ has an axis of symmetry of $x = -1.$ If $a = 2,$ then find $b.$

 Mar 2, 2024
 #1
avatar+128794 
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The x coordinate of the vertex =  -1  =    -b / (2a)

 

So

 

-b / ( 2 * 2)   = -1

 

-b / 4 =  -1

 

b/4 = 1

 

b  = 4

 

cool cool cool

 Mar 2, 2024

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