How to evaluate the sum of two functions

The teacher addresses a student's question by explaining how to handle functions and their inputs. The explanation includes identifying the domain of a function, changing input values, and performing function addition. A specific example is provided to illustrate the process, concluding with a confirmation of understanding.

What is the function F(x) = 3x + 1 used to illustrate in the video?

• The calculation of limits

• How input values change in a function

• The process of integration

• The concept of derivatives

When the input value is still x, what does the teacher ask students to identify?

• The range of the function

• The integral of the function

• The domain of the function

• The derivative of the function

What is the first step when changing the input value in a function?

• Add a constant to the function

• Substitute the new input value into the function

• Differentiate the function

• Identify the range

In the example given, what is the result of substituting 4 into the function F + G of X?

• 18

• 21

• 19

• 20

What mathematical operation is performed after substituting the input value in the example?

• Multiplication

• Division

• Addition

• Subtraction