Evaluating Algebraic Exp & Distributive Property

An algebraic expression must contain a ____________

• number

• variable

• operational sign

• parenthesis

Evaluate the algebraic expression 2x + 5, x=7

• 19

• 2(7) + 5

• 14 + 5

Simplify the expression 9(2x + 6)

• 18x + 54

• 18x + 6

• 2(9) + 6

Evaluate the algebraic experssion: -4x - 17, x = (-4)

• -1

• 16 + (-17)

• -4(-4) + (-17)

A variable is a number or letter that represents a number

• True

• False

A variable can be a letter or a symbol

• True

• False

When you evaluate an expression, you substitute a number for the variable

• True

• False

Evaluate and solve the expression 8x + 10, x=4

• 42

• 8(4) + 10 = 32 + 10 = 42

• 32 + 10 = 42

Simplify the expression -8(4x - 6)

• -32x - 48

• -32x -6

• -32x + 48

Is the following correct: 7(-6b + 5a) = -42b + 35a

• yes

• no