Предмет: Алгебра, автор: nutlikesjkolo

Помогите пожалуйста. Очень нужна помощь

Представьте в виде произведения:

1. x^4 − (x^2 + 2y)^2;

2. (18p − 5q)^2 − (9p + 15q)^2.

Ответы

Автор ответа: сок111213
1

 {x}^{4}  - ( {x}^{2}  + 2y) {}^{2}  =  {x}^{4}  - (( {x}^{2} ) {}^{2}  + 2 \times  {x}^{2}  \times 2y + (2y) {}^{2} ) =  {x}^{4}  -(  {x}^{4}  + 4 {x}^{2} y + 4 {y}^{2} ) =  {x}^{4}  - x {}^{4}  - 4 {x}^{2} y - 4y {}^{2}  =  - 4 {x}^{2} y - 4 {y}^{2}  =  - 4y( {x}^{2}  + y) \\  \\ (18p - 5q) {}^{2}  - (9 p+ 15q) {}^{2}  = (18p - 5q + 9p + 15q)(18p - 5q  -  9p  -  15q) = (27p + 10q)(9p - 20q)

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