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2(g(x)) + 1 = 2x²-1
2(g(x))= 2x²-2
g(x) = x²-1
2.karena gof adalah fungsi f dimasukkan dalam fungsi g, maka :
g(2x+1) = 4x²+4x
(2x+1)²-1 = 4x²+4x
maka fungsi g(x) = x²-1
semoga bermanfaat :)