Choose the function whose graph is given by: +
2x1
251
O A. y=-4cos(1)
o B. y= Acos(2x)
O c. y=4cos(1)
O D. y = 4cos(2x)

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

i would say true? if the unit was informational and it "refreshed your understanding", then true.