Definition: The domain of a function is the set of all possible input values (x-values) for which the function is defined.

Example: For f$x$ = √$x+3$, the domain is [-3,∞) because x+3 ≥ 0

Vocabulary: Radicand - The expression under a radical symbol

Definition: Intersection points with axes occur where either x=0 $y-axis$ or y=0 $x-axis$.

Highlight: These intersection points are crucial for graphing functions and understanding their behavior.

Example: To find y-axis intersection, substitute x=0 into the function equation and calculate y.

Definition: Functions are mathematical relationships where each input value corresponds to exactly one output value.

Example: A polynomial function f$x$ = x² - 3x² + 2x - 5 demonstrates how coefficients affect the graph's shape.

Highlight: Understanding function domains is crucial for estudio de funciones 4 eso, particularly for logarithmic and radical functions.