Question

(2y-5)²+(3y-5)(3y+5)+40yупростите выражениеy= -2​

Answer 1

Ответ:

4у²-20у+25у+9у²-25+40у=13у²+20у

13(-2)² +20*(-2)

13(-2)²-20*2

-2(-13*2+10*2)

-2(-26+20)

-2(-6)=12

Answer 2

Ответ:

12

Пошаговое объяснение:

(2у-5)^2+(3у-5)(3у+)+40у=4у^2-20у+25+9у^2-25+40у=13у^2+20у

при у=-2    13*(-2)^2+20*(-2)=13*4-40=52-40=12

Answer 3

To simplify the expression, we first need to substitute y with -2 and then perform the calculations.

Given the expression: (2y - 5)² + (3y - 5)(3y + 5) + 40y

Let's plug in y = -2:

(2(-2) - 5)² + (3(-2) - 5)(3(-2) + 5) + 40(-2)

Now, simplify each term:

1. (2(-2) - 5)² = (-4 - 5)² = (-9)² = 81
2. (3(-2) - 5)(3(-2) + 5) = (-6 - 5)(-6 + 5) = (-11)(-1) = 11
3. 40(-2) = -80

Now, the simplified expression becomes:

81 + 11 - 80 = 92 - 80 = 12

So, when y = -2, the simplified expression is 12.