F(x)=x²-2
fog(x)=4x²+4x-1
Tentukan rumus fungsi g(x)
subtitusi g(x) = m
f(m) = 4x²+4x-1
f(x) = x²-2
f(m) = m²-2 <= f(m) = 4x²+4x-1
4x²+4x-1 = m²-2
m² = 4x²+4x+1
m = +-√(4x²+4x+1)
g(x) = √(4x²+4x+1) atau -√(4x²+4x+1)
F(x)=x²-2
fog(x)=4x²+4x-1
Tentukan rumus fungsi g(x)
subtitusi g(x) = m
f(m) = 4x²+4x-1
f(x) = x²-2
f(m) = m²-2 <= f(m) = 4x²+4x-1
4x²+4x-1 = m²-2
m² = 4x²+4x+1
m = +-√(4x²+4x+1)
g(x) = √(4x²+4x+1) atau -√(4x²+4x+1)