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Find the vertex of the graph of the equation \(y = -2x^2 + 8x - 15.\)

 Apr 9, 2020
 #1
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+1

Find the 'x' value of the vertex = - b/(2a)       a = -2  b = 8

    plug this value in to find the 'y' value

 Apr 10, 2020
 #2
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+2

y = -2x^2 + 8x - 15

 

x coordinate  of vertex  =  -8 / [ 2 * -2]  =  -8/ -4  =  2

 

y cordinate  of the vertex  =  -2(2)^2  + 8(2)  - 15  =  - 8  + 16 - 15  =   -7

 

So  vertex =  ( 2, -7)

 

 

cool cool cool

 Apr 10, 2020

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