Question

the graph of quadratic function has a domain (-oo,oo) and range of [4,oo). in two or more complete sentences, explain how the given range of the function can help you to determine whether the graph opens up or down

Answer 1

The range of the function is the possible y-values that the function can take on. It also starts at the y-value of the vertex. If the range is going to positive infinity we know that the graph opens upward. If the range goes to negative infinity we know that the graph opens downward.