OK so I was going through work and I come across this question 3/4 x 4/7 do you know it?
1 answer:
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Hello,
1)
I suppose we must write correcty and corrects the mistakes!
f(x)=x+3
y=x+3
->x=y+3 exchange x and y
->y=x-3 solve for y
f^(-1)(x)=x-3=g(x)
Here are the mistakes:
(fog)(x)=f(g(x))=f(x-3)=(x-3)+3=x and not -x !
(gof)(x)=g(f(x))=g(x+3)=(x+3)-3=x and not -x!!
f(x) and g(x) ARE inverses each another.
2)
f(x)=1/(4x) x≠0
y=1/(4x)
->x=1/(4y)
->y=1/(4x)
g(x)=f^(-1)(x)=1/(4x)=f(x), x≠0
1)
I suppose we must write correcty and corrects the mistakes!
f(x)=x+3
y=x+3
->x=y+3 exchange x and y
->y=x-3 solve for y
f^(-1)(x)=x-3=g(x)
Here are the mistakes:
(fog)(x)=f(g(x))=f(x-3)=(x-3)+3=x and not -x !
(gof)(x)=g(f(x))=g(x+3)=(x+3)-3=x and not -x!!
f(x) and g(x) ARE inverses each another.
2)
f(x)=1/(4x) x≠0
y=1/(4x)
->x=1/(4y)
->y=1/(4x)
g(x)=f^(-1)(x)=1/(4x)=f(x), x≠0