If (x – 5) is a factor of f(x), which of the following must be true?
a root of f(x) is x = –5.
a root of f(x) is x = 5.
both x = –5 and x = 5 are roots of f(x).
neither x = –5 nor x = 5 is a root of f(x).

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation: