.Evaluate : 30^3+20^3-50^3

Question

I have a lot of problems

Answer 1

30³+20³-50³  can be written as:

= (30)*(30)*(30) + (20)*(20)*(20) - (50)*(50)*(50)

 

you can factor 1000 out for everything to make the problem simpler.

(10)*(10)*(10) = 1000

 

= 1000(3³+2³-5³)

= 1000(27+8-125)

= 1000(35-125)

= 1000(-90)

= -90,000