Learn how to evaluate a quadratic function

The video tutorial explains how to evaluate the function G(x) = -x^2 for the input a+1. It begins by substituting a+1 into the function, then uses the FOIL method to expand (a+1)^2. The tutorial continues by combining and simplifying the terms, resulting in the expression -a^2 - 2a - 1. The video concludes by summarizing the steps taken to evaluate the function for a+1.

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