3x square + 2x - 5 , 2x square + x + 9 , -3x cube + 2x square + 3x + 4

the correct answer is d

hope this

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.

you can use a^2+ b^2=c^2