Astudent is given the problem: which of the following statements is false?

option C is FALSE, i.e. Completing the square can be used to solve the given equation.

Step-by-step explanation:

Given the problem is x³ + 7x + 9 = 0.

We can solve the problem using "Complete Square method" if it is given in the quadratic form of x² + 2ax + a² = 0 with degree 2.

We see that given problem has degree 3 instead of 2, so we can not complete the square in this problem.

So we have some TRUE facts:-

A. Completing the square can not be used to solve the given equation.

B. Completing the square can only be used to solve a quadratic equation.

D. Completing the square can not be used because of the x³ term.

It means the only False fact is that:-

C. Completing the square can be used to solve the given equation.

Hence, option C is FALSE, i.e. Completing the square can be used to solve the given equation.

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.