Question

calcule: (20x^3 - 10x^2 + x) - (5x^3 - 3x^2 + 7)=​

Answer 1

$= (20 {x}^{3} - 10 {x}^{2} + x) - (5 {x}^{3} - 3 {x}^{2} + 7) \\ = (20 - 5) {x}^{3} - ( 10 -3) {x}^{2} + x - 7 \\ = 15 {x}^{3} - 7 {x}^{2} + x - 7$