If #f(x)= 8-3x^2#, what is its value when #x=3#?

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Answer 1 · 2018-05-23T23:28:44

#f(3)=-19#

Substitute #3# for #x#.

#f(3)=8-3(3)^2#

Simplify #3^2# to #9#.

#f(3)=8-3(9)#

Simplify #3(9)# to #27#

#f(3)=8-27#

Simplify.

#f(3)=-19#