Plug in 3 for x
f(3) = 2(3) + 1
f(3) = 6 + 1
Solution is 7
Answer:
Last option: 4
Step-by-step explanation:
The quadratic equation simplified:
has the form:

In this case, you can identify that "a", "b" and "c" are:

To solve this quadratic equation by completing the square, Carlos should add
to both sides of the equation. This is:

Then:
Therefore you can observe that the number he should add to both sides of the equation is: 4
Answer:
A
Step-by-step explanation:
I am not sure though. Sorry if it is wrong :(