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Chapter 1: Q. 17MCQ (page 27)

Evaluate the expression whenx=20andy=5.

y2−x

Short Answer

Expert verified

The value of the expression is5.

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 the exponent

To evaluate the given expressiony2−x, substitute 20 for x and 5 for y and simplify further as shown below

y2−x=(5)2−20=25−20

03

Step 3  . Subtract the numbers

Now to simplify further, subtract the numbers to get

25−20=5

Thus, the value of the expression is 5.

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Describe in order the steps you would take to evaluate the expression

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