Verified answer

[tex] {x}^{3} - 3 {x}^{2} - 39 \: \: from \: \: 14 {x}^{3} - 3 \\ \\ = 14 {x}^{3} - 3 - ( {x}^{3} - 3 {x}^{2} - 39) \\ \\ = 14 {x}^{3} - 3 - {x}^{3} + 3 {x}^{2} + 39 \\ \\ = 14 {x}^{3} - {x}^{3} + 3 {x}^{2} - 3 + 39 \\ \\ = 13 {x}^{3} + 3 {x}^{2} + 36[/tex]

Answer:

13x^3+3x^2+36

-3-(-39)=-3+39=36

14-1=13

-(-3x^2)=3x^2