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Chapter 1: Q21. (page 30)

Evaluate each expression if a=-5, b=6 and c=2.8

2b-15

Short Answer

Expert verified

The absolute value of expression is3.

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 the multiplication inside the bracket
  • Perform the subtraction 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

2b-15=2×6-15=-3

03

Step3- Find the absolute value of expression inside the bracket

The absolute value of -3=3.

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Most popular questions from this chapter

Use the following information.

Simple interest is calculated using the formula I=prt, where prepresents the principal in dollars, rrepresents the annual interest rate, and trepresents the time in years. Find the simple interest Igiven each of the following values.

p=$5000,r=3.75%,t=10years

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