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Chapter 1: Q80. (page 18)

Evaluate each expression if a=-5,b=0.25,c=12, andd=4.

80. a+2b-c

Short Answer

Expert verified

Expression a+2b-c results into -5

Step by step solution

01

- Order for simplification 

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

- Substitute given values

Substitute -5 for a, 0.25 for b and 12for c into given expression

a+2b-c=-5+20.25-12

03

- Simplify -5+20.25-12

Now, to simplify firstly perform multiplication then addition/subtraction from left to right to get

鈭�5+20.25鈭�0.5=鈭�5+0.5鈭�0.5=鈭�5

Thus, a+2b-c=-5

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