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Given the function f(x)=x^2-13 find the indicated values

Given the function f(x)=x^2-13 find the indicated values. 
a) f(13) Simplify answer   b) f(a) Simplify answer 
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1 Answer

Just plug in the x values.
So,
 
a) f(13) = (13)^2 - 13
        = 169 - 13
        = 156
 
b) f(a) = a^2 - 13

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