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For what constant k is -1 the minimum value of the quadratic 4x^2-12x+k over all real values of x? x can not be unreal 

 Jun 27, 2020
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Minimum value of x will be    -b/2a  = - -12/8 =   1 1/2

 

sub in x = 1.5

 

4 (1.5)^2 -12 (1.5) + k    = - 1

9 - 18 + k = -1

k = 8

 Jun 27, 2020

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