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Answer 1 · 2017-03-15T03:41:08

#g(f(5))= -68#

#f(x) = 3 x^2# and #g(x) = 7-x#

#f(5) =3(5)^2 = 75#

therefore,
#g(f(5)) = g(75) = 7 -75 = -68#

Answer 2 · 2017-03-15T03:47:28

#rArr-68#

#g ( f(5))#

#rArrg(3xx 25)#

#rArrg(75)#

#rArr7-75#

#rArr-68#