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Chapter 1: Q7. (page 30)

Evaluate each expression if a=-4 and b=1.5

-a+21

Short Answer

Expert verified

The absolute value of the expression is-17

Step by step solution

01

Step1- Order of evaluation

To evaluate any expression involving one operation, follow the below order of operation

  • First replace the algebraic expression inside the grouping symbols like matrix brackets ( ) with numeric expression
  • Perform addition inside the bracket
  • Evaluate the absolute value
02

Step2-- Simplify the expression inside grouping symbol

To evaluate the value of given expression, simply the expression inside the bracket and then find the absolute value of expression as shown below

鈭�|a+21|=鈭�|4+21|=鈭�|17|

03

Step3- Find the absolute value of expression inside the bracket

The absolute value of -17=-17.

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