Translating Expressions to Words
What are variables?
Letters we use to represent a number we don't know.
How do you write the mulitplication between a variable and a number, and in what order do you write it?
You write them together with the number first.
What is "substitution"?
When you "substitute" a variable for a given number
How do you use the distributive property?
When you multiply the number outside the parenthese by all the terms inside the parenthese!
What are like terms?
Terms that have the same variable (letter)
How do you say 3x in words?
3 times a number
Write an expression for "six more than a number."
x + 6
If x = 2, evaluate 3x + 5
11
Expand 3(x + 4).
3x + 12
Can constants (plain numbers) be like terms?
(example: are 2 and 7 like terms?)
Yes!
What is the phrase for the expression 5x + 3?
Five times a number plus three.
Write an expression for "four times a number."
4x
If y = -3, evaluate 4y - 6.
-18
Expand 5(2x - 3).
10x - 15
Simplify 2x + 3x.
5x
What is the phrase for the expression 2x - 3?
"three less than twice a number"
Write an expression for "the product of four and the sum of a number and three."
4(x + 3)
If x = 4, evaluate x² - 3x + 7.
5
Expand -2(3x + 7).
-6x - 14
Simplify 4y - 2y + 7.
2y + 7
What is the phrase for the expression 4(2 + x)?
Four times the sum of two and a number.
Write an expression for "twice the difference of a number and seven.
2(x - 7)
If a = 3 and b = 2, evaluate 2a² - 3b + 1.
10
4(2x - 3) + 5(x + 1).
13x - 7
Simplify 3x + 5 + 2x - 1.
5x + 4