Question

5. Evaluate the function f (x) = 4•7^x for x=-1 and x= 2. Show your work.

Answer 1

Answer:

Given

f

(

x

)

=

4

⋅

7

x

For

x

=

−

1

we have

f

(

−

1

)

=

4

⋅

7

−

1

=

4

7

using

a

−

n

=

1

a

n

For x=2, we have

f

(

2

)

=

4

⋅

7

2

=

196

Step-by-step explanation:

Answer 2

Answer:

See below

Step-by-step explanation:

$f(x) = 4. {7}^{x} \\ \\ plug \: x = - 1 \\ \\ f( - 1) = 4. {7}^{ - 1} \\ \\ f( - 1) = \frac{4}{7} \\ \\plug \: x = 2 \\ \\ f( 2) = 4. {7}^{ 2} \\ \\ f( 2) = 4 \times 49 \\ \\f( 2) = 196$