What is the unknown factor that makes each of the following statements true?

5-х = ? (х-5)

b-k=? (k-b)

- 3 х + 7 = ? (3 х - 7)

A. - 1/2

B. 1

C. - 2

D.-1

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Let F (x) = 3x + 5 and g (x) = x^2 Find g (x) / f (x) and state its domain. 3x + 5/x^2; domain is the set of all real numbers except 0 x^2/3x+5; domain is the set of all real numbers except - 5/3 x/8; domain is the set of all real numbers x/3x+5;