Simplify the expression 3(x + 2)(x2 − x − 8).

3x^3+3x^2-30x -48

Step-by-step explanation:

we apply distributive property

3(x + 2)(x^2 − x − 8)

so we have:

(3*x+3*2)(x^2 − x − 8)

(3x+6)(x^2 − x − 8)

3x*x^2 - 3x*x -3x*8 + 6*x^2 -6*x -6*8

3x^3-3x^2-24x +6x^2 -6x -48

3x^3+3x^2-30x -48

all it means is function 3

4a. is 3 miles every hour

4b. is 1/3 of an hour per mile

step-by-step explanation: