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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]
[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).
I would not however call the rote formula "phony," despite the fact that it is not easily memorized whereas the method of intersection with the X-axis is (not that I've forgotten the rote method, although I prefer to think of it as solving (ax + b)² = b² − ac when finding the roots of ax² + 2bx + c, because the mean of the roots is the ...
When multiplication is mentioned in elementary mathematics, it usually refers to this kind of multiplication. From the point of view of algebra, the real numbers form a field, which ensures the validity of the distributive law. First example (mental and written multiplication)
So, set up automatic transfers, either directly from your paycheck or from a checking account, and go on with your life. This way, your status quo is reset, and attaining your goals are safely ...
Photo: Getty 1) Polish your silver Aluminum foil makes for an awesome "sponge" when it comes to cleaning silverware. Click the link above for how to do it. 2) In your dryer Balling up a bit of ...
A Catholic nun with the Sisters of Charity Institute in Milan was among 25 people arrested early Thursday morning for a litany of mafia-related crimes, including aiding and abetting extortion ...
In mathematics, the method of equating the coefficients is a way of solving a functional equation of two expressions such as polynomials for a number of unknown parameters. It relies on the fact that two expressions are identical precisely when corresponding coefficients are equal for each different type of term.