Question

Функция задана формулой f(x)=2x²-1. Поставьте в квадрате после утверждения знак "+", если оно верно, и знак "-", если оно неверно. 1)f(1)=12)f(4)=153) f(-2)=-94) f(0)=05) f(-1)=16) f(-5)=19

Answer 1

1) +
2) -
3) -
4) -
5) +
6) -

Answer 2

1. f(1) = 2(1)² - 1 = 2(1) - 1 = 2 - 1 = 1. Therefore, the statement is false (-).

2. f(4) = 2(4)² - 1 = 2(16) - 1 = 32 - 1 = 31. Therefore, the statement is false (-).

3. f(-2) = 2(-2)² - 1 = 2(4) - 1 = 8 - 1 = 7. Therefore, the statement is false (-).

4. f(0) = 2(0)² - 1 = 2(0) - 1 = 0 - 1 = -1. Therefore, the statement is false (-).

5. f(-1) = 2(-1)² - 1 = 2(1) - 1 = 2 - 1 = 1. Therefore, the statement is false (-).

6. f(-5) = 2(-5)² - 1 = 2(25) - 1 = 50 - 1 = 49. Therefore, the statement is false (-).

So, the correct answer is: -+-+--.