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The Product and Quotient Rules

The rules that we have already discussed are summarized below.

The following rules hold for nonnegative integers m and n and a ≠ 0.

a m · a n = a m + n Product rule
Quotient rule
a 0 = 1 Zero exponent

Cuation

The product and quotient rules apply only if the bases of the expressions are identical. For example, 32 · 34 = 36, but the product rule cannot be applied to 52 · 34. Note also that the bases are not multiplied: 32 · 34 ≠ 96.

Note that in the quotient rule the exponents are always subtracted, as in

If the larger exponent is in the denominator, then the result is placed in the denominator.

 

Example 1

Using the product and quotient rules

Use the rules of exponents to simplify each expression. Assume that all variables represent nonzero real numbers.

Solution

a) Because the bases are both 2, we can use the product rule:

23 · 22 = 25 Product rule
  = 32 Simplify
b) (3x)0(5x2)(4x) = 1 · 5x2 · 4x Definition of zero exponent
  = 20x3 Product rule
c) Quotient rule

d) First use the product rule to simplify the numerator and denominator:

Product rule
Quotient rule

 

 
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