Question

преобразуйте в многочлен: 1) 3х(3х+7)-(3х+1)^2; 2) (у-4)^2-(4-у)(4+у)

Answer 1

1)9x^2+21x-9x^2-6x-1=15x-1;
2)y^2-8y+16-16+y^2=2y^2-8y;