Question

Applying properties of Exponents in exercise,use the properties of exponents to simplify the expression.See example 1.

(a) 5^3/5^6
(b) (1/5)^-2
(c) (81/2)(21/2)
(d) (32^3/2)(1/2)^3/2

Answer 1

(a) 1/125 or 1/5³

(b) 5² or 25

(c) 3⁴×7/2²

(d) 2⁶ or 64

Explanation:

Laws of Indices:

First law:

Multiplication law ⇒ xᵃ × xᵇ = xᵃ⁺ᵇ

Second Law:

Division law ⇒ xᵃ ÷ xᵇ = xᵃ⁻ᵇ

Third Law:

Negative Index ⇒ x⁻ᵃ = 1/xᵃ

Forth Law:

Root power ⇒ x¹/² = √x

Fifth Law :

Fractional index ⇒ xᵃ/ᵇ =
`\sqrt[b]{x^(a) }`

(a) 5³/5⁶

5³/5⁶ = 5³⁻⁶ ( first law)

⇒ 5⁻³ = 1/5³ ( Third law)

⇒ 1/125

(b) (1/5)⁻²

⇒ 5⁽⁻¹⁾⁽⁻²⁾ ( Third law)

⇒ 5²

⇒ 25

(c) (81/2)(21/2)

⇒ 81/2 × 21/2

⇒ 3⁴×7/2²

(d) (32³/²)(1/2)³/²

⇒( 2⁽⁵⁾⁽³/²⁾)(2⁽⁻¹⁾⁽³/²⁾)

⇒ 2¹⁵/² × 2⁻³/²

⇒ 2⁽¹⁵⁻³⁾/² (first law)

⇒ 2¹²/²

⇒ 2⁶

⇒ 64