Question 1090054
find f(-5) if f(x) = 4x^3+23x^2+11x-23
<pre>
Write the equation first. 
Then, everywhere there is an x, put (-5) in place of it.
Then simplify down to where f(-5) equals just one number: 

{{{matrix(5,11,

f(x^""),
"",
""="",
"",
4x^3,
""+"",
23x^2,
""+"",
11x,
""-"",
23,

f((-5)^""),
"",
""="",
"",
4(-5)^3,
""+"",
23(-5)^2,
""+"",
11(-5),
""-"",
23,

f(-5^""),
"",
""="",
"",
4(-125),
""+"",
23(25),
""+"",
(-55),
""-"",
23,

f(-5^""),
"",
""="",
"",
-500,
""+"",
575,
""-"",
55,
""-"",
23,

f(-5^""),
"",
""="",
"",
-3,
"",
"",
"",
"",
"",
""


)}}}

Edwin</pre>