Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Algebra I –Wilsen Unit 1: The Beginnings Day Nine Block 2 Evaluating Expressions with One Variable An “expression” is a mathematical expression that includes variables but isn’t an equation. A “variable” is a letter or symbol that represents a number. Any of these can be used as variables: Ú k p m f a b x y z These are all examples of algebraic expressions that use variables: ∆+ 2 3p 5x – 8 To evaluate an algebraic expression means to simplify it down to one value, or number. But first, we need to know what number the variable represents. Example 1 Evaluate the expression if a = –2 if a =4 if a = 3a 1 3 page 42 Example 2 Example 3 Evaluate z–5 if z=8 if z = –2 if z=0 Evaluate 3x + 1 if x = 3 if x = –3 if x = Example 4 Evaluate 2 9 1+ 2m 2 if m = 1 if m = –1 if m = 3 page 43 Evaluate each expression for the value that has been given. 1) 5v – 2 if v= –3 2) 3n + 10 if n = 6 3) 3x + 10 if x = –3 4) 10 + 3a if a = –4 5) –5y – 4 if y = 2 6) –5m – 4 if m = –3 7) – 2(3c + 8) if c = –4 page 44 8) – 2(3c + 8) if c = 2 9) –2© – 4 if © = 4 10) –2© – 4 11) x 1 + 5 2 if © = –5 if x = 5 (don’t forget you need a common denominator to add fractions) 12) x 1 + 5 2 if x = 10 page 45 13) x 1 + 5 2 if x = 4 page 46