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Which proves that the square of a number composed of tens and units, contains the square of the tens plus twice the product of the tens by the units, plus the square of the units.
Elements of Geometry - Page 101
by Adrien Marie Legendre - 1825 - 224 pages

## Elements of Algebra

Silvestre François Lacroix - Algebra - 1818 - 276 pages
...double the tens plus the unite, or 2 a + b ; this multiplied by 7 or 6, reproduces 609 = 2 ab + 62, or double the product of the tens by the units, plus...operation shows, that 47 is the square root of 2209. V If it were required to extract the square root of 324 ; the operation would be as follows ; 3,24...

## Elements of Algebra

Silvestre François Lacroix - Algebra - 1825 - 276 pages
...double the tens plus the units, or 2 a -\- b ; this multiplied by 7 or 6, reproduces 609 — 2 a 6 -f- b3, or double the product of the tens by the units,...root of 324; the operation would be as follows ; 3,24 1 18 22,4 f 28 224 Proceeding as in the last example, we obtain 1 for the place of tens of the root...

## A Theoretical and Practical Arithmetic: In which the Principles of that ...

Bézout - Arithmetic - 1825 - 236 pages
...for the square, the number 2916, which, as we see, is composed of the square of the tens, plus twice the product of the tens by the units, plus the square of the units of the number 54. 134. What we have, observed being an immediate consequence of the rules of multiplication,...

## Elements of Algebra, Volume 1

Silvestre François Lacroix - Algebra - 1831 - 298 pages
...double the tens plus the units, or 2 a -f- b ; this, multiplied by 7 or 6, reproduces 609 = 2 ab + 62, or double the product of the tens by the units, plus...root of 324; the operation would be as follows ; 3,24 1 18 22,4 22,4 28 000 Proceeding as in the last example, we obtain 1 for the place of tens of the root...

## The Youth's Assistant in Theoretic[!] and Practical Arithmetic ...

Zadock Thompson - Arithmetic - 1832 - 168 pages
...the square of a number consisting of tens and units is made up of the square of the units, plus twice the product of the tens, by the units, plus the square of the tens. See this exhibited in figure F. As 10X 10=100, the square of the tens cau never make a part of...

## The Youth's Assistant in Theoretic and Practical Arithmetic: Designed for ...

Zadock Thompson - Arithmetic - 1832 - 168 pages
...the square of a number consisting of tens and units is made up of the square of the units, plus twice the product of the tens, by the units, plus the square of the tens. See this exhibited in figure F. As 10X 10=100, the square of the tens can never make a part of...

## Elements of Algebra: Tr. from the French of M.Bourdon. Revised and Adapted ...

Charles Davies - Algebra - 1835 - 353 pages
...that the square of a number composed of tens and units contains, the square of the tens plus twice the product of the tens by the units, plus the square of the units. 117. If now, we make the units 1, 2, 3, 4, &c., tens, by annexing to each figure a cipher, we shall...

## A New Introduction to the Science of Algebra...

Silas Totten - Algebra - 1836 - 304 pages
...units, we shall have, for the square of a + b, a2 + 2ab + b ; that is, the square of the tens, twice the product of the tens by the units, plus the square of the units. Let a = 8, and b — then, since a represents the tens, and b the units, a + b becomes 80 + 5 = 85...