Warm Up #7 Simplify each expression. 1. (–2)3 – – 34 –56

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Presentation transcript:

Warm Up #7 Simplify each expression. 1. (–2)3 –8 2. 52 – 34 –56 1. (–2)3 –8 2. 52 – 34 –56 3. A gigabyte is about 103 megabytes. A music player has 4 gigabytes of memory. About how many megabytes is this? 4000 megabytes

Use properties of Exponents 5.1 Use properties of Exponents Objective: Simplify expressions involving powers

Evaluate numerical expressions EXAMPLE 1 Evaluate numerical expressions 7. (–4 25)2 = (– 4)2 (25)2 Power of a product property = 16 25 2 Power of a power property = 16 210 = 16,384 Simplify and evaluate power. 9. 115 118 –1 118 115 = Negative exponent property = 118 – 5 Quotient of powers property = 113 = 1331 Simplify and evaluate power.

Use scientific notation in real life EXAMPLE 2 Use scientific notation in real life A swarm of locusts may contain as many as 85 million locusts per square kilometer and cover an area of 1200 square kilometers. About how many locusts are in such a swarm? = 85,000,000 1200 = (8.5 107)(1.2 103) Write in scientific notation. = (8.5 1.2)(107 103) Use multiplication properties. = 10.2 1010 Product of powers property = 1.02 101 1010 Write 10.2 in scientific notation. = 1.02 1011 Product of powers property

GUIDED PRACTICE for Examples 1 and 2 Evaluate the expression. 1. (42 )3 4096 ANSWER 2. (–8)(–8)3 ANSWER 4096 3. 2 3 9 8 ANSWER 729

GUIDED PRACTICE for Examples 1 and 2 6 10 – 4 9 107 18.

EXAMPLE 3 Simplify expressions 5. b–4b6b7 = b–4 + 6 + 7 = b9 10. Product of powers property 10. s–2 –3 s3 (s–2 )–3 ( s3 )–3 = Power of a quotient property = s 6 s–9 Power of a power property = s15 Negative exponent property 11. 16m4n –5 2n–5 = 8m4n –5 – (–5) Quotient of powers property = 8m4n0= 8m4 Zero exponent property

EXAMPLE 4 Standardized Test Practice #16 (x–3y3)2 x5y6 = (x–3)2(y3)2 x5y6 x –6y6 x5y6 = = x –6 – 5y6 – 6 = x–11y0 = 1 x11

GUIDED PRACTICE for Examples 3, 4, and 5 Simplify the expression. 6. x–6x5 x–3 4. (7y2z5)(y–4z–1) x–4 7y-2z4

GUIDED PRACTICE for Examples 3, 4, and 5 14. s 3 2 t–4 15. x4y–2 3 x3y6

Classwork/Homework pages 333-334 (3-39 multiples of 3, and #52)