Respuesta :

WillJ
All you have to do is plug in 3 for x. 9+3 is 12, and 12^2 is 144. Your answer is f(3) = 144.
²Ok, so when they say to find f(3) this just means that they want you to replace the x value with the number 3 and solve it that way.

f(x) = (9+x)²
f(3) = (9+3)²
f(3) = (12)²
f(3) = 144

Hope that helps :)

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