In this lesson on exponents part 2, the focus is on evaluating variable expressions with exponents by replacing variable bases with negative numbers. The transcript provides examples of how to do this in two ways - by writing out the meaning of the expression first or by directly substituting the numerical value with the variable in parentheses. The key takeaway is to be careful when replacing the base with a negative number and to put the base in parentheses to avoid mistakes.
Shows how to evaluate variable expressions containing exponents,focusing on when you replace a variable base with negative numbers.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com