Given the function f(x) = x2 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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the function is a quadratic, parabola f(x) = a*x^2 + b*x + c
here a=1, and b and c are zero

the thing starts opening upwards f(x) = x^2
to open down, need a negative in the front

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