(04.07)

Which of the following exponential functions goes through the points (1, 6) and (2, 12)? (2 points)



f(x) = 3(2)x

f(x) = 2(3)x

f(x) = 3(2)−x

f(x) = 2(3)−x

Verified Answer :

Answer:

The correct option is 1.

Step-by-step explanation:

If the exponential function passing through a point  it means the points satisfies the function.

If the exponential functions goes through the points (1, 6) and (2, 12). It means the value of the function at x=1 is 6 and the value of the function at x=2 is 12.

The first function is

\(f(x)=3(2)^x\)

Put x=1

\(f(x)=3(2)^1=6\)

Put x=2

\(f(x)=3(2)^2=12\)

Both points are satisfied by this function therefore the correct option is 1.

The second function is

\(f(x)=2(3)^x\)

Put x=1

\(f(x)=2(3)^1=6\)

Put x=2

\(f(x)=2(3)^2=18\)

This equation does not satisfy the second point therefore the option 2 is incorrect.

Since the power is in negative, therefore at x=2 the value of function is in the fraction form, therefore options 3 and 4 are incorrect.