Step 2: Find the vertex using the formula x=-b/2a
x=4/2(1)

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.

hey pal. the answer is b plz mark as brainliest

if i knew id you bro,, my bad