Write the quadratic equation whose roots are -6 and 6, and whose leading coefficient is 1 .

The quadratic equation is:

Step-by-step explanation:

If the roots of the quadratic equation are "-6" and "6", then it must have the following factors:  

Therefore, we can write the equation in factor form as:

where a is a real number constant factor. Now, this equation in standard form will look like:

Therefore, using the information about the leading coefficient being "1" (one), we derive that the constant  factor must be "1". The final expression for the quadratic becomes:

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.