Getty Images
WS TD View of Ceiling to floor of inside of factory
WS TD View of Ceiling to floor of inside of factory
Getty Images
HD time lapse of satellite dish with clouds move
HD time lapse of satellite dish with clouds move
Bloomberg
Shepherdson: Fed at 2% Next Year on Five Rate Hikes
Nov. 17 -- Ian Shepherdson, founder at Pantheon Economics, discusses rising U.S. inflation expectations and his outlook for the Federal Reserve in response to President-Elect Donald Trump's economic plan. He speaks on "Bloomberg...
AFP News Agency
CLEAN : Chile: the world's largest telescope gets a little closer to the stars
The construction of the Extremely Large Telescope (ELT) is progressing in northern Chile, for the creation of the most powerful optical observation instrument, capable of pushing the limits of science and increasing the existing...
Khan Academy
Parabola Focus and Directrix 1
In this video, starting with a point (focus) and a line below the point (directrix), Sal tries to find the set of all points (locus) central to the point and the line. Using the distance formula, he shows that we have a parabola equation.
Khan Academy
Solving a Quadratic by Factoring, Quadratic Equations, Algebra I
The central concept in this video is solving quadratics by factoring. Several examples are shown with positive and negative numbers. The instructor demonstrates setting the factored equation to zero to solve the quadratic, using a graph...
Curated OER
Parabola Focus and Directrix 1
Starting with a point (focus) and a line below the point (directrix), in this video, Sal tries to find the set of all points (locus) equidistant to the point and the line. He shows, using the distance formula, that indeed, we have an...
Curated OER
What is the Vertex of a Quadratic Function?
The vertex of an upward facing parabola is the lowest point on the parabola and is called the minimum. The vertex on a downward facing parabola is the highest point on the parabola and is called the maximum. These are the two...