If f(x) = x^3 − 5 and f(k) = 3 then k =

Question

A. -22
B. 2
C. 4
D. 6
E. 22

niks18 · Answer

f(x)=x^3-5

f(k)=k^3-5=3

=>k^3=8 => k=2

Option  B

KSBGC · Answer

f(x) = x^3 − 5

and

f(k) = 3

So,  x^3 - 5 = 3

x^3 = 8

x^3 = 2^3

The best answer is B.

ScottTargetTestPrep · Answer

Since f(k) = 3, we substitute k for x in the function x^3 − 5, obtaining :

k^3 - 5 = 3

k^3 = 8

k = 2

Answer: B

BrushMyQuant · Answer

f(x) = x^3 − 5 and f(k) = 3

To find f(k) we will replace x with k in f(x) = x^3 − 5

=> f(k) = (k)^3 − 5 = = 3
=> k^3 = 5 + 3 = 8 = 2^3
=> k = 2

So,  Answer will be B 
Hope it helps!

Watch the following video to MASTER Functions and Custom Characters

https://www.youtube.com/watch?v=b7JoMX0gk8M

Ayeka · Answer

f(x)= x^3-5 
f(k)=3 
f(k)= k^3-5=3
k^3=3+5=8
k^3=2^3 
k=2

Answer: B

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