Given the function f(x) = x^2 and k = –1, which of the following represents a function opening downward?
f(x) + k
kf(x)
f(x + k)
f(kx)

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@sleepyhead314 @wolf1728

the coefficient of x would have to be negative in order for the function to open downward

Figured I'd come here but sleepyhead seems to be ding quite well

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