Question

(х+3) - (х-5)(x+5) при х = -1,5.​

Answer 1

Решение:

$(x + 3) - (x - 5)(x + 5) = x + 3 - {x}^{2} + 25 = x + 28 - {x}^{2}$

Теперь вместо x подставляем выражение:

$x + 28 - {x}^{2} = - 1.5 + 28 - ( - 1.5) {}^{2} = - 1.5 + 28 - 2.25 = 24.25$

Ответ:24,25

Answer 2

To find the value of the expression (х+3) - (х-5)(x+5) when х = -1.5, you simply need to substitute -1.5 for х in the expression and then perform the calculations.

Let's do the math step-by-step:

Expression: (х+3) - (х-5)(x+5)

Substitute х = -1.5:

(-1.5 + 3) - (-1.5 - 5)(-1.5 + 5)

Now, calculate the values inside the parentheses:

(1.5 + 3) - (-6.5)(3.5)

Perform the additions:

4.5 - (-6.5 * 3.5)

Now, calculate the multiplication:

4.5 - (-22.75)

To subtract a negative number, you can change it to addition:

4.5 + 22.75

Finally, perform the last addition:

27.25

So, when х = -1.5, the value of the expression is 27.25.