Watch Video on The Quadratic Formula - Algebra Help
Wednesday, August 26th, 2009
Access full lesson containing this video at: http://www.yourteacher.com/algebra2/thequadraticformula.php Students learn to solve quadratic equations in the form ax^2 + bx + c = 0 using the quadratic formula, which states that x = -b plus or minus the square root of b^2 — 4ac over 2a. For example, to solve the equation x^2 — 3x — 8 = 0, since a = 1, b = -3, and c = -8, the quadratic formula states that x = 3 plus or minus the square root of (-3)^2 — 4(1)(-8) over 2(1). Simplifying on the right side of the equation, x = 3 plus or minus the square root of 9 + 32 over 2, or x = 3 plus or minus the square root of 41 over 2, which is the final answer. Note that students also learn to derive the quadratic formula using completing the square in the first example problem in this lesson.
Duration : 0:3:39
See how to Copy or Export only visible Excel worksheet data retaining all formulas, subtotals and worksheet formatting and deleting all hidden rows and hidden columns.
Access full lesson containing this video at: http://www.yourteacher.com/geometry/areaoftriangle.php Students learn the formula for the area of a triangle, and are asked to solve problems using this formula. Note that right triangle formulas and trigonometry are used extensively in the problems in this lesson.
Using VLOOKUP in one worksheet to look up values located in a second worksheet