Question

Identify the expression equivalent to 2x 8 by substituting x = 7 and x = 5. a. 2x 10 10 b. 2(x 2) c. (x 4) (x 4) d. (x 4) e. 2(2x 4)

Answer 1

the expression equivalent to 2x + 8 is (x+4) + (x+4)

using the commutative property we can say that

2x +8 = x + x + 8

also 2x + 8 = x + 4 + x + 4

hence 2x + 8 = (x+4) + (x+4)

What is an expression?

• Mathematical statements are called expressions if they have at least two terms that are related by an operator and contain either numbers, variables, or both.
• Addition, subtraction, multiplication, and division are all possible mathematical operations.
• There are two sorts of expressions in mathematics: numerical expressions, which only contain numbers, and algebraic expressions, which also include variables.
• In a mathematical expression, the following terms are used:

• An absolute numerical number is referred to as a constant.
• Variable: A symbol without a set value is referred to as a variable.
• Term: A term can be made up of a single constant, a single variable, or a mix of variables and constants multiplied or divided.
• a number that is multiplied by a variable is referred to as a coefficient.

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