Adding and subtracting functions

The video tutorial explains how to perform operations on two given functions, F(x) = x^2 + 6 and G(x) = sqrt(1 - x). It covers the addition and subtraction of these functions, highlighting the importance of understanding how to combine terms and the limitations when terms cannot be combined. The tutorial concludes with a brief mention of future content.

What is the significance of parentheses when combining functions?

Why can't the square root and X^2 be combined?