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iwanttogotostanford
 one year ago
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)
iwanttogotostanford
 one year ago
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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iwanttogotostanford
 one year ago
Best ResponseYou've already chosen the best response.0@sleepyhead314 @wolf1728

sleepyhead314
 one year ago
Best ResponseYou've already chosen the best response.1the coefficient of x would have to be negative in order for the function to open downward

wolf1728
 one year ago
Best ResponseYou've already chosen the best response.2Figured I'd come here but sleepyhead seems to be ding quite well

sleepyhead314
 one year ago
Best ResponseYou've already chosen the best response.1since "k" is a negative number I would assume that they would like for us to multiply "x" with "k" somehow

iwanttogotostanford
 one year ago
Best ResponseYou've already chosen the best response.0i was thinking it'd be B or D?

sleepyhead314
 one year ago
Best ResponseYou've already chosen the best response.1D means that you would replace "kx" into the equation for "x" that would get you f(kx) = (1x)^2 ^^ since this is squared, it would come out as a Positive so that cannot be right

iwanttogotostanford
 one year ago
Best ResponseYou've already chosen the best response.0i don't know what it would be...

iwanttogotostanford
 one year ago
Best ResponseYou've already chosen the best response.0@sleepyhead314

sleepyhead314
 one year ago
Best ResponseYou've already chosen the best response.1since it cannot be D then your other guess may be correct ;)

sleepyhead314
 one year ago
Best ResponseYou've already chosen the best response.1although the formatting is a bit confusing ..

wolf1728
 one year ago
Best ResponseYou've already chosen the best response.2k = 1 f(x) = x^2 then k(fx) = x^2

iwanttogotostanford
 one year ago
Best ResponseYou've already chosen the best response.0so it would be B??:)

wolf1728
 one year ago
Best ResponseYou've already chosen the best response.2yes as sleepyhead said the formatting is weird

iwanttogotostanford
 one year ago
Best ResponseYou've already chosen the best response.0thank you both! I will have one more question up and then done!
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