Power point 1
Transcript of Power point 1
ALGEBRAIC
EXPRESSIONS
VERBAL DESCRIPTION OF
EXPRESSION IN SYMBOLIC
FORM
ALGEBRAIC EXPRESSION
FROM VERBAL DESCRIPTION
EVALUATING EXPRESSIONS
DEFINITIONS
• Algebraic Expression – contains
symbols, variables, and constants.
• Verbal Expression – sentence from
algebraic expression.
http://www.tutorvista.com/math/verbal-expressions-in-
math
EXAMPLES
• Giving verbal descriptions of
expressions presented in symbolic
form.
• Translate:
3 + b
10ab
3x ÷ b
“Three plus b”
“Ten times a times b”
“Three times x divided by b”
EXAMPLES
• Representing verbal model with
symbols.
“A divided by 2”
“60 miles per hour”
“3 people buy 6 dogs and
2 buy 3”
A÷2 A/2
60mi 60mi/1hr
1 hr
3(6)+2(3)
EXPRESSIONS
• Expressions contain VARIABLES.
•Variables: letters with different values.
•Ex: x² + 4x – 2 Variable: x
SOLVING WITH VARIABLES
1. Substitute # value for variable.
1. (x=3) x² + 4 (3)² + 4
2. Calculate solution by ORDER OF
OPERATIONS. (Left to right.)
P.E.M.D.A.S. (ORDER OF
OPERATIONS)
P - Please
E - Excuse
M - My
D - Dear
A - Aunt
S - Sally
P – Parenthesis
E – Exponents
M – Multiplication
D - Division
A - Addition
S - Subtraction
SOLUTION
P. No parenthesis
E. (3)² = 9 9 + 4(3) – 2
M. (4·3) = 12 9 + 12 – 2
D. No division
A. (9 + 12) = 21 21 – 2
S. (21 – 2) = 19 Solution = 19
1. Calculate solution.
MULTIPLE VARIABLES
SOLVE JUST LIKE 1 VARIABLE
1. Substitute # value for variable.
2. Calculate solution by ORDER OF
OPERATIONS. (Left to right.)
EXAMPLE
A = 1 B = -4 C = 10 D = 22 E = -6
A + B - C + D + E
1 + (-4) - 10 + 22 + (-6)
(Left to Right) -3 - 10 + 22 + (-6)
-13 + 22 + (-6)
9 + (-6) = 3 Solution = 3