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(gof)(x)=2x² + 4x + 5
g(X) = 2x + 3
Ditanyakan :
f(X) = ?
Penyelesaian :
~g(f(x))=2x^2+4x+5
g(f(x))=2*f(x)+3
2x^2+4x+5=2*f(x)+3
2x^2+4x+5-3=2*f(x)
2x^2+4x+2=2*f(x)
f(x)=x^2+2x+1