Question

Найти значение выражения -2,5х(-х/2+3), если х=3

Answer 1

$- 2.5x( \frac{ - x}{2} + 3) = - 7.5( \frac{ - 3}{2} + 3) = 11.25 + ( - 22.5) = 11.25 - 22.5 = - 11.25$

Answer 2

To find the value of the expression -2.5x(-x/2 + 3) when x = 3, you simply need to substitute the value of x into the expression and perform the calculations.

Step 1: Replace x with 3 in the expression: -2.5 * 3 * (-(3)/2 + 3)

Step 2: Simplify the expression inside the parentheses: -2.5 * 3 * (-1.5 + 3)

Step 3: Continue simplifying: -2.5 * 3 * (1.5)

Step 4: Multiply the numbers: -2.5 * 4.5

Step 5: Calculate the final result: -11.25

So, when x = 3, the value of the expression -2.5x(-x/2 + 3) is -11.25.