Question

(t+2)⋅(t−9)−t2 при t=−10, предварительно упростив его.

Answer 1

(t+2)⋅(t−9)−t2 = t2-9t+2t-18-t2 =  -7t-18,

-7t-18, при t= -10

-7 ⋅ (-10) - 18 = 70-18= 52

Ответ: 52

Answer 2

(10+2)*(10-9)-10*2

1)10+2=12

2)10-9=1

3)12*1=12

4)10*2=20

5)12-20=-8

Answer 3

To simplify the expression (t+2)⋅(t−9)−t^2 and evaluate it for t = -10, we'll follow these steps:

Step 1: Expand the expression (t+2)⋅(t−9). Step 2: Simplify the expanded expression. Step 3: Substitute t = -10 and evaluate the result.

Step 1: Expand the expression (t+2)⋅(t−9). Using the distributive property, we get:

(t+2)⋅(t−9) = t⋅t + t⋅(-9) + 2⋅t + 2⋅(-9) = t^2 - 9t + 2t - 18

Step 2: Simplify the expanded expression. Combine like terms:

t^2 - 9t + 2t - 18 = t^2 - 7t - 18

Step 3: Substitute t = -10 and evaluate the result.

Now, let's substitute t = -10 into the simplified expression:

t^2 - 7t - 18 = (-10)^2 - 7(-10) - 18 = 100 + 70 - 18 = 152

So, when t = -10, the expression (t+2)⋅(t−9)−t^2 simplifies to 152.