3 2044 097 012 009

NORMAL

ELEMENTARY ALGEBRA:

CONTAINING THE

FIRST PRINCIPLES OF THE SCIENCE,

DEVELOPED WITH CONCISENESS AND SIMPLICITY,

FOR

COMMON SCHOOLS, ACADEMIES, SEMINARIES AND NORMAL SCHOOLS.

REVISED EDITION.

BY EDWARD BROOKS, A. M., PH.D.,

LATE PRINCIPAL OF PENNSYLVANIA STATE NORMAL SCHOOL, AND AUTHOR OF THE NORMAL
SERIES OF ARITHMETICS, "NORMAL GEOMETRY AND TRIGONOMETRY,"

"PHILOSOPHY OF ARITHMETIC," ETC.

"Mathematical studies cultivate clearness of thought, acuteness of analysis
and accuracy of expression."

QUI NON

PROFICIT-DEFICIT

PHILADELPHIA:

CHRISTOPHER SOWER COMPANY,

614 ARCH STREET.

HARVARD COLLEGE LIBRARY
GIFT OF THE

NEWTON FREE LIBRARY

AUG 9 1934

Eutered according to Act of Congress, in the year 1871, by
EDWARD BROOKS,

In the Office of the Librarian of Congress, at Washington

Recopyright, 1888, by EDWARD BROOKS.

WESTCOTT & THOMSON,

Stereotypers, Philada

Carton Proma of
SHERMAN & Co.. PHILADELPHIA.

Symbols of Operation.................... 20

Symbols of Relation..................................................... 22 Positive and Negative Quanti-

Algebraic Expressions..................

23

ties......