The graph of a quadratic function has a domain of (-∞, ∞) and range of [4, ∞). 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.
it if opens up, then the range will extednd to positive infinity. if it opens down then the range will exted to negative infintiy. there, 2 complete sentances so we got range is from 4 to infinty so it opens up