Question

Номер 356 в фото СРОЧНО ДАМ 60 БАЛОВ

Answer 1

1) (2x^2- 14x + 9)+ (-2x^2+ 4x + 11) =
2x^2- 14x + 9 - 2x^2+ 4x + 11 = 20 - 10x;
2)19a^4−17a^2b+b^3(−a^4−22a^2b+b^3)=19a^4−17a^2b+b^3+a^4+22a^2b−b^3=20a^4+5a^2b