Shido88
f(x)= 2x/x+3 and g(x)=5/x
find:
(f o g)(x) ?



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Shido88
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@marsss

Shido88
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hey @Mertsj :D

Mertsj
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f composite g means to replace each x in the function f with the function g

Shido88
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2(5/x) / (5/x)+3 right ?

CanadianAsian
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f o g means f(g(x))
if g(x) = 5/x and f(x) = 2x/(x+3)
Then f o g = 2(5/x)/(5/x + 3)

Mertsj
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dw:1359320337310:dw

Shido88
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ok cool :) but I'm stuck from there...

Mertsj
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dw:1359320391800:dw

Mertsj
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Multiply numerator and denominator by x to simplify the complex fraction.

Shido88
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10/x / 3+5/x ?

Mertsj
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dw:1359320436709:dw

Shido88
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isn't it suppose to be 10/x ?

Shido88
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that's the part im stuck from

Mertsj
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dw:1359320617741:dw

Mertsj
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That's the point of multiplying by x: the denominators cancel