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EXAMPLE 1

Music. You buy a used guitar for $50 . You then pay $10 for each of five guitar lessons. The total cost can be found by evaluating the expression 50 + 10 5 . Is the total cost $100 or $300 ?. EXAMPLE 1. Following Order of Operations. To find the guitar costs described, evaluate

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EXAMPLE 1

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  1. Music You buy a used guitar for $50. You then pay $10 for each of five guitar lessons. The total cost can be found by evaluating the expression 50+105. Is the total cost $100 or $300? EXAMPLE 1 Following Order of Operations

  2. To find the guitar costs described, evaluate 50+105. 50+105 = 100 ANSWER The total cost is$100. EXAMPLE 1 Following Order of Operations =50+50 First multiply 10 and 5. Then add 50 and 50.

  3. – Evaluatex3y3whenx=25andy=2. – – = 25 3(23) x 3y3 – = 253(8) = – 2524 = 1 EXAMPLE 2 Evaluating a Variable Expression Substitute25forxand2fory. Evaluate the power. Multiply8and3. Subtract24from25.

  4. – 1. 2. 3. 5 +6 5 20 422 10 3+ 33 ANSWER ANSWER ANSWER 35 12 57 for Examples 1 and 2 GUIDED PRACTICE Evaluate the expression.

  5. 4. Evaluatea+4b2whena=6andb=5. ANSWER 106 for Examples 1 and 2 GUIDED PRACTICE

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