Question

Срочно !
Преобразуйте в многочлен :
(x-4y)(x+4y)-(y+5x)(5x-y);
(c+d)(c-d)(d²+c²).

Answer 1

х²-16у²- (у²+25х²)=х²-16у²-у²-25х²

Answer 2

1.$x^{2} - y ^{2} - 25 x^{2} - y^{2} = 24x^{2} - 2 y^{2}$
2 $c^{2} - d ^{2} * (d^{2} + c^{2} ) = c^{2}d^{2} + c^{4} - d^{4} - d^{2} c^{2} = c^{4} - d^{4}$