Help! What’s the measure of angle RST? Please explain, I want to learn.
2 answers:
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The expression for (r-s)(x) is found by subtracting s from r. That difference is 
. The expression for (r+s)(x) is found by adding them, which is 
. Now we are told to evaluate (r*s)(x) which means they want us to multiply those and state the "new" expression that results. 
. There you go!