And then I also want to figure out the point exactly in between, which is the vertex. And if I can graph those three points then I should be all set with graphing this parabola. So as I just said, we're going to try to solve the equation 5x squared minus 20x plus 15 is equal to 0.
Historical Uses For Evening Primrose. All parts of evening primrose are edible. Native Americans in Utah and Nevada ate the seeds. The young leaves can be used raw in salads or as a potherb. They are usually cooked in several changes of water to get rid of their bitterness.
Evening primrose (Oenothera biennis) opens its four-petaled blossoms after sunset or on dark cloudy or rainy days. It is worth the time to visit an evening primrose plant at dusk and watch as the cream to bright yellow petals unfold like a slow-motion film.