A graph is a function if there is only one X value for any Y value.
Since the graph is in the shape of a U, there can only be one X for every Y value, so this graph is a function.
The answer is C.
Answer:
x² + 3x - 28
Step-by-step explanation:
Each term in the second factor is multiplied by each term in the first factor
(x + 7)(x - 4)
= x(x - 4) + 7(x - 4) ← distribute both parenthesis
= x² - 4x + 7x - 28 ← collect like terms
= x² + 3x - 28