X^4-81=0 factor with work please

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

If f(x) = 2x - 6 and g(x) = 3x + 9, find (f - g)(x). a. (f-g)(x) = x + 15 o o b. (f- g)(x) = -x - 15 o c. (f- g)(x) = 5x + 3 o d. (f- g)(x) = -x+3 submit

For which pair of functions is (gof)(a)=|a|-2?