Question

2x²-x-1,5 При х=-0,5

Answer 1

2 × (-0,5)² - (-0,5) - 1,5

(2 × 0,25) + 0,5 - 1,5

0,5 + 0,5 - 1,5 = -0,5

Ответ: -0,5

Answer 2

To find the value of the expression 2x² - x - 1.5 when x = -0.5, we simply substitute the value of x into the expression and perform the calculation.

Let's plug in x = -0.5:

2(-0.5)² - (-0.5) - 1.5

Now, let's solve the expression step by step:

1. First, calculate (-0.5)²: (-0.5)² = 0.25

2. Next, calculate 2 times the result from step 1: 2 * 0.25 = 0.5

3. Now, calculate -(-0.5): -(-0.5) = 0.5

4. Finally, add up the results from steps 2 and 3, and subtract 1.5: 0.5 + 0.5 - 1.5 = 0.5 - 1.5 = -1

Therefore, when x = -0.5, the value of the expression 2x² - x - 1.5 is -1.