SOLUTION: I don't understand this at all, some help would be appreciated.. (x − 0.8)(x − 0.5) [4.6]

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Question 486587: I don't understand this at all, some help would be appreciated..
(x − 0.8)(x − 0.5) [4.6]
Answer by chessace(471)   (Show Source): You can put this solution on YOUR website!
It is a little weird.
My best guess is that it is an explicit un-named function with an argument:
Define f(x)=(x-0.8)(x-0.5)
Evaluate f with/at x = 4.6
f[4.6] = ...(sub that value for the 2 x's and compute).
f(4.6)= 3.8 * 4.1 = 15.58
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