View Full Version : sat math functions

Brynlee

08-22-2013, 06:58 PM

If f(x)=-x+4 and f(h(2))=10, which of the following could be the function h(x).

(A) h(x)=-x+4

(B) h(x)=5x

(C) h(x)=-2x-2

(D) h(x)=-6x

(E) h(x)=10

Thanks:D:D

Function composition is a way of combining functions such that the result of each function is passed as the argument of the other function. (f\circ h)(x)= f(h(x))

f(h(2))=10 \Rightarrow -h(2)+4=10 \Rightarrow h(2)=-10+4=-6 (1)

The only function from (A)-(E) that satisfy the equality (1) is choice (C) h(x)=-2x-2

since h(x)=-2x-2=-2(2)-2=-4-2=-6.

Brynlee

08-22-2013, 07:02 PM

:DThank you Jack!!:D

Powered by vBulletin® Version 4.2.2 Copyright © 2018 vBulletin Solutions, Inc. All rights reserved.