The function f is given as f(x)=−3x−18. What is the root of f?

Answer 1

root = -6

root = the zero or x intercept

0= -3(-6) - 18 = 18 - 18 = 0

f(x) = -3x - 18 = 0

3x = -18

x = -18/3 = -6

(-6, 0) is the point where f(x) crosses the x intercept

Answer 2

root= -6

You find the root by finding the zero of the x intercept.

f(x)=-3x-18 (-6,0)= So, -6 is the root

-3x-18=0

-3x=18

x=-18/3

x=-6