Simplify the expression [math]x^4 • y^{–2} • x^7 • z^0[/math]. Write the expression using only positive exponents.
[list=1] [*]Use the exponent rule [math]a^m • a^n = a^{m + n}[/math] to simplify the expression. [*]Use the exponent rule [math]a^0 = 1[/math] to further simplify the expression. [*]Use the exponent rule [math]a^{-m} = \frac{1}{a^m}[/math] to write the negative exponent as a positive exponent. [/list] This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit [url="http://www.walch.com"]www.walch.com[/url] for more information on their resources.