document.write( "Question 128684: Let f(x) = -x - 5 and g(x) = 2x + 3\r
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Algebra.Com's Answer #94143 by solver91311(24713) $\"\"$ $\"About$

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document.write( "Discussion
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document.write( "A few words about function notation.  If f is a function, then f(x) is the
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document.write( "value of the function at x, usually denoted by some sort of rule for finding
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document.write( "the value of the function given that you know the value of x.  f(a) would be
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document.write( "the value of the function at a, and f(4) would be the value of the function at,
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document.write( "yep, you guessed it, 4.
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document.write( "Solution
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document.write( "In this case the value of the function f at x, or f(x) is given by the rule:
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document.write( ".  You want to know f(4), which is the value of the function at
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document.write( "4, so 
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