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The FOIL method is a special case of a more general method for multiplying algebraic expressions using the distributive law. The word FOIL was originally intended solely as a mnemonic for high-school students learning algebra. The term appears in William Betz's 1929 text Algebra for Today, where he states: [2]
For the metal foil, they tested a variety of metals, but favoured gold because they could make the foil very thin, as gold is the most malleable metal. [ 15 ] : 127 As a source of alpha particles, Rutherford's substance of choice was radium , which is thousands of times more radioactive than uranium.
In either case, the use or non-use of the term "FOIL" is moot. - dcljr 22:24, 3 September 2009 (UTC) How new is the FOIL method? The oldest (only) reference in the article is 1997. If it's a new pedagogical device then it's not too surprising to see it meeting some resistance, especially by those opposed to learning by memorizing rules.
[1] [2] When n = 2, it is easy to see why this is incorrect: (x + y) 2 can be correctly computed as x 2 + 2xy + y 2 using distributivity (commonly known by students in the United States as the FOIL method). For larger positive integer values of n, the correct result is given by the binomial theorem.
The foil “lid” will help prevent the meat from drying out as you cook it for round two. For more Better Homes & Gardens news, make sure to sign up for our newsletter! Read the original article ...
Just avoid using this on non-stick surfaces that might scratch. And while you're in scrub-mode, you can also use foil to polish and restore chrome! Start by dipping the foil in some water before ...
Use aluminum foil My favorite kind of fix is one that only requires items I have in my house (and if it’s yours, too, here’s why you should put paper towels in the fridge and add these secret ...
Don Quixote and his sidekick Sancho Panza, as illustrated by Gustave Doré: the characters' contrasting qualities [1] are reflected here even in their physical appearances. In any narrative, a foil is a character who contrasts with another character, typically, a character who contrasts with the protagonist, in order to better highlight or differentiate certain qualities of the protagonist.