Key to New Practical Algebra, for Teachers

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Maynard & Company, 1877
 

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Page 148 - For, if we have given ab' = a'b, then, dividing by bb', we obtain Corollary. The terms of a proportion may be written In any order which will make the product of the extremes equal to the product of the means.
Page 147 - ... 1 . Given, the sum of two numbers equal to 25, and their difference equal to 9, to find the numbers. Solution, by using one unknown quantity. Let x= the less number ; then K+S)= the greater.
Page 225 - Arrange the terms according to the powers of some one letter ; take the square root of the first term for the first term of the required root, and subtract its square from the given polynomial.
Page 187 - When any two successive terms in the series are given, it is evident that the ratio may be found by dividing any term by the preceding term.
Page 163 - Let x = the greater, and y = the less. Then x : y :: x+y...
Page 173 - Let x = the second number, And y = the common difference. Then, x— y+x+x+y = 15; or 3ж=15, ж=5.

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