Question 203212
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*[tex \Large f] and *[tex \Large g] are functions, the notation *[tex \Large f(x)] and *[tex \Large g(x)] mean "the value of the function *[tex \Large f] (or *[tex \Large g]) at *[tex \Large x]".


So if *[tex \Large f(x) = 2x + 3] then *[tex \Large f(1) = 2(1) + 3], that is, the value of the function *[tex \Large f] at 1.  *[tex \Large f(a) = 2a + 3], the value of the function *[tex \Large f] at *[tex \Large a], and so on.  You just substitute the given value, whatever it is, for the independent variable in the function definition.


Finally, *[tex \Large (f + g)(x) = f(x) + g(x) = (2x + 3) +  (x^2 - 3x + 4)].  You just need to simplify the new expression.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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