Question

Evaluate 2x(second power)-1 when x = 3.
А. 35
В. 5
C. 25
D. 17

Answer 1

The answer is 17

Explanation:

2x² - 1

When x = 3

2(3²) - 1

2*9 - 1

18 - 1

= 17

Answer 2

Option D, 17

Explanation:

Step 1: Set x to 3

`2x^2 - 1`

`2(3)^2 - 1`

`2(9) - 1`

`18 - 1`

`17`

Answer: Option D, 17