Question

evaluate 30 Cube + 20 cube - 50 cube

Answer 1

${30}^{3} + 20 {}^{3} - {50}^{3} \\ = {50}^{3} - {50}^{3} \\ = {0}^{3} \\ = 0$

Answer 2

(30×30×30)+(20×20×20)-(50×50×50)
27000+8000-125000
35000-125000
-90000