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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asked Oct 26, 2017 195k views

2 Answers

GAgnew · Answer 1 · 2017-10-30T15:23:34+0000

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)