<PRE><B>Question 303676</B>
Given: {{{(A - C)*(A + C)}}}, where A = -1, B = 2, C = -3

-16 Is not the correct answer.  I also noticed that B is not used in the equation.  Using the equation that you have posted, this is the solution:
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{{{(A - C)*(A + C)}}} Substitute
{{{(-1 - -3)*(-1 + -3)}}} 
You must do the operations inside the parenthesis first.
{{{(2)*(-4)}}} Simplify
{{{highlight(-8)}}}
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