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-2x^2=y+4x
x=√y+4x/-2
f^-1(x)=
y=√x+4x/-2
despejamos x
y - 2 = -(2x²+4x+2)
(y - 2) = - ((√2x)²+4x+(√2)²)
(y-√2)= - ((√2x)² + 2(√2*x)√2 + (√2)²)
-(y-2)=(x√2 + √2)²
√(2-y)= √(x√2+√2)²
√(2-y)=x√2+√2
√(√-y) - √2 =x√2
√(2 - y) - √2 √2(√(2 - y)-√2)) √2*√(2 - y) - √2*√2 √2√(2 - y) - 2
x= ----------------------- = -------------------------- = --------------------------- = ---------------------
√2 √2*√2 2 2
Cambiamos la "x" por "y"⇒ la funcion inversa queda
√2√(2 - x) - 2
⇒ y = ----------------------
2