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Apply all relevant properties of exponents to simplify the following expressions. Enter your answer as an integer or completely simplified fraction without exponents. a) \( (-8)^{-2} \) Answer b) \( \left(-\frac{1}{8}\right)^{-2} \) Answer c) \( -8^{-2} \) Answer d) \( -\left(\frac{1}{8}\right)^{-2} \) Answer

Ask by Wells Fleming. in the United States
Feb 26,2025

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Answer

a) 1/64 b) 64 c) –1/64 d) –64

Solution

We will simplify each expression step by step using the properties of exponents. a) (–8)⁻²  Step 1: Apply the negative exponent rule: a⁻ⁿ = 1/(aⁿ).  Step 2: Compute (–8)² = (–8) × (–8) = 64.  Thus, (–8)⁻² = 1/64. b) (–1/8)⁻²  Step 1: Again use the rule a⁻ⁿ = 1/(aⁿ).  Step 2: Compute (–1/8)². The square of a negative number becomes positive, so (–1/8)² = 1²/8² = 1/64.  Step 3: Therefore, (–1/8)⁻² = 1/(1/64) = 64. c) –8⁻²  Note: Here the exponent applies only to 8 (not to –8); the expression is interpreted as –(8⁻²).  Step 1: Compute 8⁻² = 1/(8²) = 1/64.  Step 2: Include the negative sign: –(1/64) = –1/64. d) –((1/8)⁻²)  Step 1: Compute (1/8)⁻². Using a⁻ⁿ form, (1/8)⁻² = 8² = 64.  Step 2: Now apply the negative sign: –64. Thus, the completely simplified answers are: a) 1/64 b) 64 c) –1/64 d) –64

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To simplify the given expressions using properties of exponents: a) \( (-8)^{-2} \) When simplifying this, remember that a negative exponent indicates the reciprocal, so: \[ (-8)^{-2} = \frac{1}{(-8)^2} = \frac{1}{64} \] **Answer:** \( \frac{1}{64} \) b) \( \left(-\frac{1}{8}\right)^{-2} \) Again, apply the negative exponent rule: \[ \left(-\frac{1}{8}\right)^{-2} = \frac{1}{\left(-\frac{1}{8}\right)^2} = \frac{1}{\frac{1}{64}} = 64 \] **Answer:** \( 64 \) c) \( -8^{-2} \) For this expression, first deal with the exponent: \[ -8^{-2} = -\frac{1}{8^2} = -\frac{1}{64} \] **Answer:** \( -\frac{1}{64} \) d) \( -\left(\frac{1}{8}\right)^{-2} \) Use the negative exponent rule here too: \[ -\left(\frac{1}{8}\right)^{-2} = -\frac{1}{\left(\frac{1}{8}\right)^2} = -\frac{1}{\frac{1}{64}} = -64 \] **Answer:** \( -64 \)

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Algebra Mexico Feb 26, 2025
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