SOLUTION: f(x)=(3x^2)+5 If t is a number find f(t+1) and f(t-1) Simplify your answers. I am totally lost. :( Please help, thanks!

Question 707866: f(x)=(3x^2)+5
If t is a number find f(t+1) and f(t-1) Simplify your answers.
I am totally lost. :( Please help, thanks!
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
Here is how to find your way:

replace the variable, x, with the number t+1, and replace the variable, x, with the number t-1. Evaluate the function for each case. The key idea is to use substitution.

=
=
=, and maybe you complete the square to get standard form if you wish to.
That was for x=t+1.

Now do the same using t-1 in place of x.
,
...and you know what to do...
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