Question

(x-2)²-(x-1)(x+2) при x=2,5.​

Answer 1

Ответ:

Объяснение:

(x-2)^2-(x-1)(x+1)

(2,5-2)^2-(2,5-1)(2,5+1)

0,5^2-1,5•3,5=0,25-5,25=

=-5

Answer 2

To evaluate the expression (x-2)²-(x-1)(x+2) at x=2.5, we substitute the value of x into the expression and perform the calculations.

Let's substitute x=2.5 into the expression:

(2.5-2)² - (2.5-1)(2.5+2)

Simplifying the expression:

(0.5)² - (1.5)(4.5)

Calculating the values:

0.25 - 6.75

Finally, subtracting the values:

-6.5

Therefore, when x=2.5, the expression (x-2)²-(x-1)(x+2) equals -6.5.