4. i need with question in the attached picture!

ANSWER

D. 13

EXPLANATION

We have

To find

means we want to find an x-value whose image is 3.

We cross multiply,

Expand:

Combine like terms,

Option D is correct.

Step-by-step explanation:

We know that f(a) =b ⇔ f^-1 (b) =a

Using this,

We are given

and

putting value of f(x)

Option D is correct.

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.