Medal to whoever can help me solve!
The function f is defined by f(x)=x^2+2
Find f(5n).

Question

Medal to whoever can help me solve!
The function f is defined by f(x)=x^2+2
Find f(5n).

anonymous · Answer

replace x by 5n

muzzack · Answer

well replace f(x) with 5n and eith all x's

anonymous · Answer

Yeah, I did. And when I went to solve it I got slightly confused, I haven't used algebra since like last year, and unfortunately its kinda kicking my retrice

anonymous · Answer

Because then you get 5n^2+2

anonymous · Answer

$$(ab)^2 = a^2b^2$$

anonymous · Answer

Replacing it with 5n would yield answer 25n^2 + 2

anonymous · Answer

you have to square the 5 as well

anonymous · Answer

how do you get rid of the n?

anonymous · Answer

n is your friend. no need to get rid of it

anonymous · Answer

so 25n^2+2

muzzack · Answer

you have to isolate it

anonymous · Answer

okay, so would you do the square root to get the square to disappear

anonymous · Answer

no. that is your answer.

f(5n) = 25n^2 + 2

anonymous · Answer

n is just a variable

anonymous · Answer

oh.. well I just made myself look really stupid. lol

anonymous · Answer

f(3) would be (3)^2 + 2 = 9 + 2 = 11

n is just undefined

anonymous · Answer

no you didn't. this is a place to learn ^_^

muzzack · Answer

yes @Euler271

anonymous · Answer

Okay, well thank you everybody! You all were very helpful!