Question

(у-1) (у+2) + (у+1) (у-2)

Answer 1

Ответ:

Объяснение:

$(y-1)(y+2)+(y+1)(y-2)=y^2+2y-y-2+y^2-2y+y-2=2y^2-4=2(y^2-2)$

Answer 2

To simplify the given expression, let's expand the terms:

(u - 1) * (u + 2) + (u + 1) * (u - 2)

Using the distributive property, we can expand each of the two terms:

(u - 1) * (u + 2) = u * u + u * 2 - 1 * u - 1 * 2 = u^2 + 2u - u - 2 = u^2 + u - 2

(u + 1) * (u - 2) = u * u + u * (-2) + 1 * u + 1 * (-2) = u^2 - 2u + u - 2 = u^2 - u - 2

Now, combining the two expanded terms:

(u^2 + u - 2) + (u^2 - u - 2)

Next, let's simplify further by combining like terms:

u^2 + u^2 + u - u - 2 - 2

Now, combine the like terms:

2u^2 - 4

The simplified expression is:

2u^2 - 4