Factor by grouping: x^3+2x^2−4x−8. Which of the following is one of the factors? A. (x2−4x)
B. (x−2)
C. (x2−2)
D. (x2−4)

B. (x−2)

Step-by-step explanation:

Factor out x^2

x^2(x+2)-4x-8

Factor out 4

x^2(x+2)-4(x+2)

Now combine

(x^2-4)(x+2)

Factor x^2-4 (notice that it is a difference of squares)

(x+2)(x-2)(x+2)  -x+2 is twice so we can square it

(x+2)^2(x-2)

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: