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If an expression within a parenthesis is preceded by the sign +, the parenthesis may be removed without making any change in the signs of the terms of the expression.
New School Algebra - Page 11
by George Albert Wentworth - 1898

## The Progressive Arithmetic: Parts I-III.

Wilbur Fisk Nichols - Arithmetic - 1903 - 328 pages
...sum from 8. What is the result ? If 6 is written 8 — 3 — 2, would you get the same result ? 4. If an expression within a parenthesis is preceded by the sign —, the parenthesis can be removed, provided the sign before each term within the parenthesis is changed, the sign + to...

## Elementary Algebra

George Albert Wentworth - Algebra - 1906 - 440 pages
...by 10 + (3 - 2). The second process is represented by 10 + 3 - 2. Hence, 10 + (3 - 2) = 10 + 3 - 2. (2) If we use general symbols in (1) and (2), we have, a + (b + c) = a + b + c, and a + (b - G) = a + b - c. Hence, The general rule for a parenthesis preceded by + : If an expression within...

## First Principles of Algebra: Elementary Course

Herbert Ellsworth Slaught, Nels Johann Lennes - Algebra - 1912 - 300 pages
...inclosed in a parenthesis with or without change of sign, according as the sign — or + precedes. Eg a + b — c = a + (b — c) and a — b + c = a — (b — c). EXERCISES In each of the following, place the last three terms in a parenthesis. 1. x — y + 2 —...

## Practical Mathematics: Instruction Paper, Volume 3

Glenn Moody Hobbs - 1912 - 100 pages
...parenthesis may be removed without making any change in the expression within the parenthesis. (b) When a parenthesis is preceded by the — sign the parenthesis may be removed if the sign of every term within the parenthesis be changed. (c) When a number or letter immediately...

## School Algebra, Book 2

George Albert Wentworth - 1913 - 296 pages
...have the following results : aa b + с b — с a — b — с а — b + с We therefore see that a — (b + c) = a — b — c, and a — (b — c) = a — b + c. If an expression inclosed within parenthèses is preceded by the negative sign, the parentheses may...

## Junior High School Mathematics, Book 3

George Albert Wentworth, David Eugene Smith, Joseph Clifton Brown - Mathematics - 1918 - 304 pages
...from a, we have the following results: aa b +cb —c a — b — ca — b + c We therefore see that a — (b + c) = a — b — c, and a — (b — c) = a — b + c. If the parentheses inclosing an expression are preceded by the negative sign, the parentheses may be...

## Numbers and Symmetry: An Introduction to Algebra

Bernard L. Johnston, Fred Richman - Mathematics - 1997 - 276 pages
...is, (a + b) — b = a and (a - b) + b = a. • Addition and multiplication are associative, that is, a + (b + c) = (a + b) + c and a . (b . c) = (a . b) . c, for all a,b,c € R. • There is a zero element, that is, an element 0 in R with the property that...

## Algorithms and Data Structures in VLSI Design: OBDD - Foundations and ...

Christoph Meinel, Thorsten Theobald - Computers - 1998 - 292 pages
...and 0: o + l = l and a-0 = 0, Absorption: a + (a • 6) = a and o • (a + b) — a, Associativity: a + (b + c) = (a + b) +c and a • (b • c) = (a • b) • c, DeMorgan's rules: a + 6 = a • b and 0-6 = 0 + 6, Involution: 0 = 0. Figure 3.1. Computation rules...