Help with practical math please!!!!
If f(x) = 2x² + 12, what is f(3)?
A.3
b.12
c.18
d.20

Question

Help with practical math please!!!! 
 If f(x) = 2x² + 12, what is f(3)?
A.3
b.12
c.18 
d.20

anonymous · Answer

a

sleepyjess · Answer

Welcome to OpenStudy! Please only post 1 question per thread.

anonymous · Answer

okay sorry

nnesha · Answer

$\huge\color{green}{{\rm welcome ~to}\rm ~open ~study}$
please post one question learn the method then do next of tmm by ur own that would be much better thanks :)

sleepyjess · Answer

@noland_dewitte Welcome to OpenStudy! Please do not give out direct answers, as this is against the Code of Conduct.

nnesha · Answer

for first one u have to replace x by 3 in the equation then solve

sleepyjess · Answer

For the first one, just substitute in 3 for x.

sleepyjess · Answer

Hmmmmm...... I am not coming up with any of the given answers on the first one. Are you @nnesha ?

anonymous · Answer

d is 30 sorry bout that typed it wrong

nnesha · Answer

okay that's make sense

sleepyjess · Answer

What do you get when you do the problem?

nnesha · Answer

|dw:1420764491450:dw|
replace x by 3 and take square of 3