Fins the value of (15)^3 + (-9)^3 + (-6)^3 , without actually cubing the numbers​

Step-by-step explanation:

We know that,

If (a+b+c)=0, then a

3

+b

3

+c

3

=3abc

Here, 28+(−15)+(−13)=0

∴(28)

3

+(−15)

3

+(−13)

3

=3(28)(−15)(−13)=16380

a³ + b³ + c³ + 3abc = ( a + b + c)(a² + b² + c² + ab + bc + ca)

if a + b + c = 0. then a³ + b³ + c³ = 3abc

here a + b + c = 15 + (-9) + (-6)

a + b + c = 15 - 15

a + b + c = 0

so a³ + b³ + c³ = 3abc

15³ + (-9)³ + (-6)³ = 3(15)(-9)(-6)

= 2430

so the answer is 2430

step-by-step explanation:

i have done this all on a piece of paper but idk how to put it on here cuz it needs to be drawn

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.