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Given the function f(x) = x2 and k = –1, which of the following represents a function opening downward?

A. f(x) + k
B.kf(x)
C. f(x + k)
D. f(kx)

Respuesta :

Nirina7
f(x) = ax2+bx+c, is quadratic equation
function opening downward if the a<0, 
kf(x) = -x², a= -1<0  
so the answer is B.kf(x) 

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