Question

При каких значениях x выражение принимает положительное значение: (x-3)(x+5)

Answer 1

(6-3)(6+5)
3×11=11
не знаю верно нет

Answer 2

(х-3)(х+5)=х²+5х-3х-15=х²+2х-15
при х>5

Answer 3

To find the values of x for which the expression (x-3)(x+5) takes a positive value, we need to identify the intervals in which the expression is positive.

First, let's consider the signs of each factor separately:

1. (x - 3) For this factor to be positive, x must be greater than 3.

2. (x + 5) For this factor to be positive, x must be greater than -5.

Now, to find the intervals where the entire expression is positive, we need both factors to be positive:

1. x > 3
2. x > -5

Since we want both conditions to be true at the same time, the common interval is where x is greater than 3. Therefore, the expression (x - 3)(x + 5) is positive when x > 3.