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14-07-2017
Mathematics

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Let f(x) = -2x - 7 and g(x) = -4x + 3. Find (f o g)(-5)
A. -9
B. 3
C. -53
D. 23

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14-07-2017

(f o g)(-5)=f(g(-5))

first find g(-5) to make it easier

g(-5)=
-4(-5)+3=
20+3=
23

f(g(-5))=f(23)
f(23)=
-2(23)-7=
-46-7=
-53

(f o g)(-5)=-53

C is answer

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