Question 183620
in the function y=-8x to the third power +6, what is the value of f(5)
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{{{y = -8x^3 + 6}}} and {{{f(x) = -8x^3 + 6}}} are used interchangeably.  It can cause confusion.
f(x) = whatever is a function in terms of x.  Sometimes it's convenient to use y for f(x) in order to graph things, or just to save typing.
Anyway, f(5) is the value of f(x) when x = 5.  Sub 5 for x.
{{{f(5) = -8*5^3 + 6}}}
f(5) = -8*125 + 6
f(5) = -994