Question

Subtract a^3-3b^2 from b^3-3b^2

Answer 1

${b}^{3} - 3 {b}^{2} - ( {a}^{3} - 3 {b}^{2} ) \\ = {b}^{3} - 3 {b}^{2} -{a}^{3} + 3 {b}^{2} \\ = {b}^{3}-{a}^{3}$