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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!
Answer:
Let us consider the expression:
(1)
Now, the quotient of power rules says that the numbers that have same base can be find by subtracting if powers are with same sign
And adding if powers are with opposite sign.
We will solve equation (1) by this quotient of power rule.
So, it can be rewritten as:
.