Explicație pas cu pas:
a) f(x)=y
3-8x=y, 3-y=8x, x= (3-y)/8
inversa f(x)= (3-y)/8,
inversa f:R--->R
b) f(x)= y, (2x+5)/3= y
2x+5=3y, x=(3y-5)/2
inversa f(x)= (3x-5)/2,
inversa f:R--->R
c) x^2+1=y, x=√(y-1)
inverasa f(x)=√(y-1)
inversa f:[1, 2]---> [0,1]
