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)
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Home » Mathematics » 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)