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EXAMPLE 1 Find nth roots Find the indicated real nth root(s) of a. a. n = 3, a = –216 b. n = 4, a = 81 SOLUTION a. Because n = 3 is odd and a = –216 < 0, –216 has one real cube root. Because (–6)3 = –216, you can write = 3√ –216 = –6 or (–216)1/3 = –6. b. Because n = 4 is even and a = 81 > 0, 81 has two real fourth roots. Because 34 = 81 and (–3)4 = 81, you can write ±4√ 81 = ±3

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**Evaluate expressions with rational exponents**

EXAMPLE 2 Evaluate expressions with rational exponents Evaluate (a) 163/2 and (b) 32–3/5. SOLUTION Rational Exponent Form Radical Form a /2 (161/2)3 = 43 = 64 = 163/2 ( )3 = 16 43 = 64 = = 1 323/5 = 1 (321/5)3 1 323/5 = 1 ( )3 5 32 = b –3/5 32–3/5 = 1 23 1 8 = = 1 23 1 8 =

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**Approximate roots with a calculator**

EXAMPLE 3 Approximate roots with a calculator Expression Keystrokes Display a /5 b /8 7 c. ( )3 = 73/4

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GUIDED PRACTICE for Examples 1, 2 and 3 Find the indicated real nth root(s) of a. 1. n = 4, a = 625 3. n = 3, a = –64. SOLUTION ±5 SOLUTION –4 2. n = 6, a = 64 4. n = 5, a = 243 SOLUTION ±2 SOLUTION 3

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GUIDED PRACTICE for Examples 1, 2 and 3 Evaluate expressions without using a calculator. 5. 45/2 /4 27 SOLUTION 32 SOLUTION –1/2 8. 17/8 1 3 SOLUTION SOLUTION 1

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**GUIDED PRACTICE for Examples 1, 2 and 3**

Evaluate the expression using a calculator. Round the result to two decimal places when appropriate. Expression /5 SOLUTION 1.74 /3 – SOLUTION 0.06 (4√ 16)5 SOLUTION 32 (3√ –30)2 SOLUTION 9.65

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Notes Over 7.1 no real 4th roots Finding nth Roots

Notes Over 7.1 no real 4th roots Finding nth Roots

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