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Chapter 1: Q74. (page 24)

Evaluate the expression when x=2and y=8

localid="1648809832146" x-22y

Short Answer

Expert verified

The value of the expression is -2.5.

Step by step solution

01

Step-1 – Order of operations

To evaluate any expression involving more than one operation, follow the below order of operations:

  • First evaluate expressions inside grouping symbols like parentheses ( ) or brackets [ ].
  • Evaluate the exponents.
  • Perform Multiplication and division from left to right.
  • Perform addition and subtraction from left to right.
02

Step-2 – Evaluate expression inside grouping symbol

To evaluate the given expressionx-22y, substitute 2 for x and 8 for y and simplify the expression on numerator as shown below

x鈭�22y=2鈭�228=鈭�208

03

Step-3 – Divide the numbers

Now to simplify further, divide the numbers to get

鈭�208=鈭�2.5

Thus, the value of the expression is -2.5.

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