Question

Which expression has a value that is equivalent to 5n + 13 when n=−5 ? 1.2n + 2 2. 4n + 8 3. n² + 13 4.n + 8

Answer 1

2. 4n + 8

Explanation:

5n + 13 when n=−5

Lets plug in -5 for 'n' in 5n+13

5(-5) + 13 = -25 + 13= -12

Now we check with each option and see whether we get same answer -12

Plug in n=-5 in each option

1) 2n + 2 =2(-5) + 2 = -10+2= -8

2) 4n + 8 = 4(-5) + 8 = -20 + 8 = -12

3) n² + 13 = (-5)^2 + 13 = 25 + 13 = 38

4) n + 8= -5 + 8 = 3

We got same answer -12 for option 2