About Fractional Exponents:

In some cases, fractional exponents allow us to work with radicals more easily. Most commonly, this allows us to write the square root of a number or expression as being raised to the power of one - half. Similarly, when we take the cube root of a number or expression, this is the same as being raised to the power of one - third.


Test Objectives
  • Demonstrate the ability to simplify an expression raised to the power of 1/n
  • Demonstrate the ability to simplify an expression raised to the power of m/n
  • Demonstrate the ability to report a simplified answer that contains no fractional exponents in the denominator
Fractional Exponents Practice Test:

#1:

Instructions: Simplify, report your answer with no fractional exponents in the denominator.

a) $$32^{-\frac{3}{5}}$$

b) $$243^\frac{6}{5}$$

c) $$16^\frac{1}{2}$$


#2:

Instructions: Simplify, report your answer with no fractional exponents in the denominator.

a) $$81^\frac{3}{2}$$

b) $$16^\frac{3}{2}$$

c) $$10,000^\frac{5}{4}$$

d) $$27^\frac{2}{3}$$


#3:

Instructions: Simplify, report your answer with no fractional exponents in the denominator.

a) $$(n^6)^{-\frac{3}{2}}$$

b) $$(x^{16})^\frac{3}{4}$$

c) $$(343b^3)^\frac{1}{3}$$


#4:

Instructions: Simplify, report your answer with no fractional exponents in the denominator.

a) $$(ab^2)^{-\frac{1}{2}} \cdot (ba^\frac{1}{3})^\frac{3}{2}$$

b) $$(xy^\frac{1}{3})(y^2)^{-2}$$


#5:

Instructions: Simplify, report your answer with no fractional exponents in the denominator.

a) $$\frac{(x^\frac{3}{2}z^{-1}y^{-1}z^\frac{3}{2})^\frac{5}{4}}{yx^\frac{3}{2}}$$


Written Solutions:

#1:

Solutions:

a) $$\frac{1}{8}$$

b) $$729$$

c) $$4$$


#2:

Solutions:

a) $$729$$

b) $$64$$

c) $$100,000$$

d) $$9$$


#3:

Solutions:

a) $$\frac{1}{n^9}$$

b) $$x^{12}$$

c) $$7b$$


#4:

Solutions:

a) $$b^\frac{1}{2}$$

b) $$\frac{xy^\frac{1}{3}}{y^4}$$


#5:

Solutions:

a) $$\frac{x^\frac{3}{8}z^\frac{5}{8}y^\frac{3}{4}}{y^3}$$