Question

4) (a+b)(-a-b);5) (x-y)(y-x);​

Answer 1

Объяснение:

надеюсь понятно написала

Answer 2

Let's simplify the given expressions:

4. (a+b)(-a-b)

Expanding the expression: (a+b)(-a-b) = -a(a+b) - b(a+b)

Distributing the negative sign: = -a^2 - ab - ab - b^2

Combining like terms: = -a^2 - 2ab - b^2

So, the simplified expression is -a^2 - 2ab - b^2.

5. (x-y)(y-x)

Expanding the expression: (x-y)(y-x) = x(y-x) - y(y-x)

Distributing: = xy - x(x) - y(y) + y(x)

Simplifying further: = xy - x^2 - y^2 + yx

Since xy and yx are the same, we can simplify it: = xy - x^2 - y^2 + xy

Combining like terms: = 2xy - x^2 - y^2

Therefore, the simplified expression is 2xy - x^2 - y^2.