find (f*g)(x) and (g*f)(x):
f(x)=(1/2)(x) - 7
g(x)=x+6

This was a problem in my math class. so, can someone show me how my teacher got (1/2)(x)-4; (1/2)x-1?? i want to make i know how to do these problems. thanks!

Question

find (f*g)(x) and (g*f)(x):
f(x)=(1/2)(x) - 7
g(x)=x+6

This was a problem in my math class. so, can someone show me how my teacher got (1/2)(x)-4; (1/2)x-1?? i want to make i know how to do these problems. thanks!

skullpatrol · Answer

Any ideas?

skullpatrol · Answer

Where do you think we should start?

anonymous · Answer

(12x−7)⋅(x+6)

anonymous · Answer

(1/2x−7)⋅(x+6)

skullpatrol · Answer

Why do you want to start there?

anonymous · Answer

(f*g)(x), i thought i should start there... am i wrong?

skullpatrol · Answer

In math you need to think about what things "mean" first before starting, right?

anonymous · Answer

yes ok

skullpatrol · Answer

What does "(f*g)(x)" mean? and how does that meaning compare to "(g*f)(x)"?

skullpatrol · Answer

Have you ever seen this (f*g)(x) and (g*f)(x) notation or way of writing things?

skullpatrol · Answer

Hello?

anonymous · Answer

yes, sorry. i dont know what they really mean. maybe that i have to multiply them in a different order

skullpatrol · Answer

That is just a guess, does your teacher or book have this in writing any where?

anonymous · Answer

i only wrote, that f(x) was the function that was given; and g(x) is the function. And that the functions are in twos (composition functions)

skullpatrol · Answer

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