If f(x)=3x^2 then f(-2)=?

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Answer 1 · 2018-04-30T15:52:57

#f(-2)=12#

#f(x)=3x^2#

To find #f(-2)# you just need to put #-2# instead of #x#:

#f(-2)=3(-2)^2=3*4=12#

Answer 2 · 2018-04-30T15:56:29

#f(-2) = 12#

All we need to do here is substitute the number in parentheses (#-2#) for #x# in the function:

#f(-2) = 3(-2)^2 = 3(4) = 12#

Note that the negative symbol from the #-2# is included in the parentheses for the exponent.