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Chapter 1: Q45. (page 12)

Evaluate the expression x = 15 (Lesson 1.1).

200 鈥� x

Short Answer

Expert verified

The value of the expression is 185.

Step by step solution

01

– Explanation of Subtraction in mathematics

Subtraction is the process of taking away a number from another. It is a primary arithmetic operation that is denoted by a subtraction symbol (鈥�) and is the method of calculating the difference between two numbers.

02

Example of subtraction

An example of subtraction is: 28 鈥� 5 = 23.

Example: If a = 17 and b = 8, find the value of a 鈥� b

To evaluate the expressiona 鈥� b, substitute the value of a as 17 and the value of b as 8 and add the numbers as shown below,

a-b鈥�鈥�=鈥�鈥�17-8=9

03

Evaluate the expression x + 4 when x = 15 

To evaluate the expression(200 鈥� x), substitute the value of x as 15 and subtract 15 from 200, the result as shown below,

When x = 15 and the expression 200 鈥� x

200鈭�x200鈭�15=185

Thus, the value of the expression is185.

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